cfdesign 2010 manual

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cfdesign 2010 manual

Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Report this Document Download Now Save Save CFdesign 2010-Users Guide For Later 0 ratings 0% found this document useful (0 votes) 3K views 457 pages CFdesign 2010-Users Guide Uploaded by tomatlab Description: Full description Save Save CFdesign 2010-Users Guide For Later 0% 0% found this document useful, Mark this document as useful 0% 0% found this document not useful, Mark this document as not useful Embed Share Print Download Now Jump to Page You are on page 1 of 457 Search inside document Browse Books Site Directory Site Language: English Change Language English Change Language. This tool empowers you to make smart design decisions, quickly by extracting and comparing specific results values from each of your designs and scenarios. CFdesign then creates a complete performance picture by comparing all the results against the targeted critical performance values. This major upgrade addresses the needs of design engineers by providing a CFD environment that enables intuitive, fast, and simple setup and exploration of all what-if design scenarios helping to uncover critical CFD data on the first try. First time, occasional, and advanced users are able to make decisions that satisfy pass-fail targets, while exploring ideas that can improve quality and drive innovation. CFdesign 2010 Key Features Setup of design studies and details on the new decision center feature are included below, along with information on the new CFdesign Answer System and Core i7 support. An easy to use digital prototyping control panel that lets users create, add, change, and manage multi-scenario design studies. Each cloned scenario is an easily editable lightweight twin of the original, dramatically reducing the load on computer memory and graphics.

This function provides the insight that is impractical to obtain from physical testing and simply unavailable from any other CFD application. This is great for pass-fail studies and the preliminary down-select process for a what-if study. Select a group of designs or scenarios and add them into a filmstrip viewer. Drag and drop into the Design Review Center for a deep dive into the variables driving design performance. This is the place where engineers innovate. This algorithm assumes that the flow passes through the resistance, instead of deflecting off of it, and smooths the flow vectors using the upstream velocities. These upstream velocity values provide the direction for the downstream nodes. If the upstream nodes deflect the flow, then all downstream velocities will be deflected creating an odd looking vector field. A custom database called My Materials is included in the installation. It is easy to create additional databases. Only materials in the Default database are affected. Materials in custom material databases are not affected by version updates. There are several ways to do this from the Material Editor: To create a new material in the database, right click and select New material. This copies the material into the selected database. The material is not available for any other study until it is saved to a custom material database. The Local database ensures that a custom material that is assigned in a design study does not change, even if the material is modified in a separate session and saved to the database. If this happens, the following occurs: The Use Scenario box on the Material Environment dialog is automatically unchecked. It is reported to offer a computing environment that facilitates intuitive, fast, and simple setup and exploration of what-if scenarios. You can create and manage flow and thermal design studies. Design feedback is provided in standard engineering terms so you can locate information without CFD expertise.

It reportedly operates approximately 2.5 times faster than workstations running Intel Core2 Quad processors. CFdesign 2010 uses up to four cores although others can be added. It supports 32- and 64-bit Windows XP and Vista workstations.Cancel reply Comment Name Clip, share and download with the leading design engineering magazine today. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media.We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services. You consent to our cookies if you continue to use this website. Ok No Read more. CFDesign 2010 Could Help. How many people use Computational Fluid Dynamics (CFD) for flow analysis in their designs? I’m talking cardboard, tape and little whispies glued every few inches to show turbulent areas as air passes by. This is where CFDesign comes in. He demoed a few ways the program is able to simplify analysis and how it can extend to a lot of different applications. Here’s what’s interesting me and making those cardboard models look better in the trash bin. It’s, as Derrek says, “CFD for the common man.” I hear that and I immediately think, “Is there such a thing?”. For someone that isn’t involved solely in analyzing water, electrical or ventilation systems I would say, yes, prototyping flow scenarios digitally makes the effort much more simple and easier to understand. For someone that is a systems engineer or involved in systems certification, who has a deeper understanding of pressure drops or the heat absorption of various foams, this type of tool become increasingly more powerful.

The basic features each would want to know are these: This might be for airflow through a system of ducts or convection around a high-priced electrical components. Being able to compare different results side-by-side and run a report, with actual values to show a Systems Engineer, creates a general amount of benefit for a company spread out across different areas of engineering. Areas of engineering that all touch or are influenced by what happens in systems needing flow analysis. As an example, the SolidWorks plugin is able to: The mesh and boundaries can be adjusted as well. I’m looking into this a little more for the companies I work with. They’re spread out across systems that require specific values for heat absorption and sound dampening. Being able to optimize these areas will shave a lot of time off design and manufacturing while helping to standardize components. That gives you enough time to struggle with a box cutter, some tape, a heat gun, and still be able to swithc mid-way to compare the result CFDesign spits out. Do you use it already. In working with companies looking for better analysis tools, what’s the biggest benefit you see for companies that use this on a regular basis? He is involved in engineering, design, visualization, the technology making it happen, and the content developed around it. He is a SolidWorks Certified Professional and excels at falling awkwardly. Here’s Your Buyer’s Guide. June 12, 2018 MORE POSTS FROM THIS CATEGORY Press Esc to cancel. Citations (58) References (25) Abstract A novel vertical axis wind turbine (VAWT) has been developed that consists of several asymmetric vertically-stacked stages. A computational investigation of the torque characteristics of the VAWT has been conducted using the commercial computational fluid dynamics (CFD) software CFdesign 2010. A validation study consisting of steady and rotating simulations was conducted using a Savonius rotor and good agreement was obtained with experimental data.

Steady two-dimensional CFD simulations have demonstrated that the new VAWT has similar average static torque characteristics to existing Savonius rotors. Request full-text Citations (58) References (25). Since the main focus of the study is on VAWT unsteady inflow wind performance as a result of blade aerodynamic fluctuations, the computational boundary preliminary tests have not been discussed in this paper. This article analyzes the aerodynamics of Savonius wind turbine with vertical axis. Blades with multi stacks can give rise to blade efficiency. For this purpose, different models of blades were suggested and the impact of blade intervals on the torque output has been studied. Moreover, the flow of fluid around the turbine rotor has been calculated with the CFD method and the standard k-.The results clearly show that the torque output increases as the intervals between the blade stacks decrease. Also this paper, for the first time, shows that as the thickness of the outer blade’s slot increases, the torque will decrease. View Show abstract. Their research have shown solving URANS equation is quite compatible in modeling flow around VAWT. Due to the constant change of angle of attack, stalling is very common in VAWT at low tip speed ratio (TSR. 19: Wake in 25 degree tilt. CFD analysis of tilted vertical axis wind turbine for offshore application Thesis Full-text available Jul 2014 Abdullah Mobin Chowdhury Horizontal Axis Wind Turbine (HAWT) is currently dominating the onshore wind energy market. HAWT has remained a popular choice to the engineers due to its higher aerodynamic efficiency than other wind turbine configurations. Now the policy makers are thinking to harness wind energy from offshore. The technology of extracting offshore wind energy is still in a preliminary level. In the recent years some popular and economical concepts like Floating Axis Wind Turbine (FAWT) has been developed.

Maintaining an upright position on floating axis base would not be economically feasible. As HAWT is known to respond negatively in yawed flow or tilted flow condition, it could not be a reliable choice for offshore application. That is why some scientists are considering Vertical Axis Wind Turbine (VAWT). The primary goal of this thesis to numerically validate an existing experimental work of VAWT in upright and tilted conditions by comparing power co-efficient. The numerical validation is carried out by means of Computational Fluid Dynamics (CFD) and a comparative analysis of VAWT in upright and tilted condition is drawn. CFD analysis of VAWT requires solving Unsteady Reynolds Averaged Navier-Stokes (URANS) equation. Upon reviewing the existing literatures regarding VAWT, it has been found that, there has not been any study regarding the choice of parameters for solving URANS equation like turbulence model, mesh dependency and time step in three dimension. Although, there are some works in two dimension, the three dimensional affect like tip vortices will be dominant in case of low aspect ratio turbine and hence could not be ignored. As this thesis is dealing with a low aspect ratio turbine and three dimensional CFD analysis of VAWT is computationally expensive, choosing the right parameters at the beginning of the research is very important. Therefore a thorough and rigorous parametric study is comprehended. After choosing the right parameters, validation is done. Following that the flow fields of upright and tilted conditions are visualized. Flow phenomenon like blade-vortices dynamics, influence of pressure in wake are discussed. The aerodynamic loads on VAWT will act as a structural load on the floating base of FAWT. That is why the effects of aerodynamic loads in upright and tilted condition on VAWT in steady condition are comparatively analyzed.

A state of art work is done in showing the importance and need of Vertical axis wind turbine (VAWT) and its further research. According to the present scenario, it is accepted that Horizontal axis wind turbine (HAWT) is covering a majority of the market, but there are issues like cost, manufacturing and installation, which led to the researches look for an alternative in terms of VAWT in order to make them feasible for use in urban areas with improved power to cost ratio. For this purpose, some case studies are summarized as a part of this review work and it has been concluded that trend of research is going towards combination of drag and lift type of VAWT. Moreover, use of alternative materials is also suggested as a part of conclusion through the present review study. Therefore the three-dimensional effects are ignored and two-dimensional transient simulations are carried out to reduce the time cost in this study.. Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes Article Full-text available Jul 2015 Baowei Song J. H. VanZwieten Jr Parakram Pyakurel Wen-long Tian The Savonius wind turbine is a type of vertical axis wind turbine (VAWTs) that is simply composed of two or three arc-type blades which can generate power even under poor wind conditions. A modified Savonius wind turbine with novel blade shapes is introduced with the aim of increasing the power coefficient of the turbine. The effect of blade fullness, which is a main shape parameter of the blade, on the power production of a two-bladed Savonius wind turbine is investigated using transient computational fluid dynamics (CFD). Simulations are based on the Reynolds Averaged Navier-Stokes (RANS) equations with a renormalization group turbulent model. This numerical method is validated with existing experimental data and then utilized to quantify the performance of design variants.

Results quantify the relationship between blade fullness and turbine performance with a blade fullness of 1 resulting in the highest coefficient of power, 0.2573. This power coefficient is 10.98% higher than a conventional Savonius turbine. The 2D simulation in the Gambit and Fluent Ansys 17.0 software has been performed by using the technique of the moving mesh and the realizable k-epsilon turbulence model, to compare the Savonius turbine performance between without (conventional turbine) and with a circular cylinder installed at the side of the advancing blade. The numerical validation is done by comparing the result with published experimental data. In this phase, the parameter used is the torque coefficient on the air fluid by varying the three meshes from coarse to fine. In simulation studies, the numerical predictions are compared to results achieved experimentally to validate the considered numerical methods.. A Comparative Computational Fluid Dynamics Study on an Innovative Exhaust Air Energy Recovery Wind Turbine Generator Article Full-text available May 2016 Seyedsaeed Tabatabaeikia Nik Nazri Nik Ghazali Wen Tong Chong Nima Izadyar Recovering energy from exhaust air systems of building cooling towers is an innovative idea. A specific wind turbine generator was designed in order to achieve this goal. This device consists of two Giromill vertical axis wind turbines (VAWT) combined with four guide vanes and two diffuser plates. It was clear from previous literatures that no comprehensive flow behavior study had been carried out on this innovative device. Therefore, the working principle of this design was simulated using the Analysis System (ANSYS) Fluent computational fluid dynamics (CFD) package and the results were compared to experimental ones.

It was perceived from the results that by introducing the diffusers and then the guide vanes, the overall power output of the wind turbine was improved by approximately 5% and 34%, respectively, compared to using VAWT alone. These results were in good agreement with experimental results obtained in the previous experimental study. Overall, it can be concluded that exhaust air recovery turbines are a promising form of green technology. The present methods of enhancing the conversion efficiency are mostly improving the wind rotor structure, optimizing the generator parameters and energy storage controller and so on. Because the conversion process involves in energy conversion of multi-energy fields such as wind energy, mechanical energy and electrical energy, the coupling effect between them will influence the overall conversion efficiency. In this paper, using system integration analysis technology, a testing system based on multi-energy field coupling (MEFC) of vertical axis wind power system is proposed. When the maximum efficiency of wind rotor is satisfied, it can match to the generator function parameters according to the output performance of wind rotor. The voltage controller can transform the unstable electric power to the battery on the basis of optimizing the parameters such as charging times, charging voltage. Through the communication connection and regulation of the upper computer system (UCS), it can make the coupling parameters configure to an optimal state, and it improves the overall conversion efficiency. This method can test the whole wind turbine (WT) performance systematically and evaluate the design parameters effectively. It not only provides a testing method for system structure design and parameter optimization of wind rotor, generator and voltage controller, but also provides a new testing method for the whole performance optimization of vertical axis wind energy conversion system (WECS).

Placing a cylinder at the side of the advancing blade has been performed to increase the positive torque and numerical analysis has been performed without and with a circular cylinder. A numerical study has represented by using a 2D analysis of CFD simulation with moving mesh technique. The k-epsilon used is Realizable k-epsilon (RKE) by second-order upwind for the discretization method. The numerical simulation uses ANSYS 17.0 software. The first step, the validation is performed by comparing the experimental result with respect to torque coefficient using air fluid. Although the measured velocity fields are similar to the results obtained using numerical simulation, it is difficult to capture a detached vortex structure through a numerical simulation. They pointed out that the shear stress transport (SST) k-v turbulence model was an effective approach to analyzing the turbine rotor.. Influence of the side-by-side arrangement on the performance of a small Savonius wind turbine Article Full-text available Jan 2016 Choon-Man Jang Sang-Moon Lee Reeho Kim Jang-Ho Lee Scaled-down Savonius turbine rotors arrayed side-by-side are introduced to analyze the effects of design parameters on the performance between turbine rotors. Unsteady flow simulation and experimental measurement have been performed to compare turbine performance and validate the numerical simulation of the turbine rotor. Single turbine rotors and two turbine rotors arrayed side-by-side were numerically analyzed. The distance between rotor tips is 0.5 times the rotor diameter. Throughout the numerical simulation, the power coefficient obtained by the time-averaged result of unsteady flow simulation was found to be in good agreement with the experimental result. A discussion on the design parameters using both a single and arrayed turbine rotors is presented based on the results of the unsteady flow simulation, including the flow field, power coefficient, velocity and vorticity contours.

They reported that the rotor shape at the concave and convex side should be a focus point of turbine development to increase the rotor torque so that it is more competitive with the existing design.. Experimental study of combined blade savonius wind turbine Article Full-text available Jan 2016 Arifin Sanusi Sudjito Soeparman Slamet Wahyudi Lia Yuliati Many modifications have been made on conventional Savonius wind turbine's rotor blades have been made to improve the performances. The rotor blade modification in this research is a blade combination where the circle-shaped conventional model is combined with the one of a concave elliptical model. The combined blade will not affect the simplicity of construction and cost of manufacture of turbine rotors. The aim is to analyze the influence of the blade combination towards the performance of Savonius turbine. The research includes experimental method using open-jet-type wind tunnel of rotor's prototype with three different blade models of the same dimension. The experiment shows, there are influences of the modification of the rotor blade to the performances of the turbine. The combined blade improves the performances of the power coefficient maximum (Cpmax) up to 11 % compared to the conventional blade at the tip speed ratio (TSR) of 0.79. View Show abstract. Savonius rotor was invented by the Finnish engineer Sigurd J Savonius with two half cylinders basic design that rotate around an axis. In this research, four different models of Savonius rotor blades are analyzed, as well as the traditional rotor. The principal aim of this research is to find the best Power Coefficient (Cp) and the best torque coefficient (Cm) for different models. In order to achieve the objective, a CFD computational model was used, with 3D simulations in transient regime. A computational domain was defined as a function of the minimal longitude in the system, and meshing is performed after a mesh size independency analysis.

In addition, 3-blade rotor presents the lowest performance of all the models with a power coefficient Cp of 0.073. View Show abstract. Therefore, the Transition SST model was employed for all the successive numerical simulations in this study.. Empirical and numerical analysis of small wind turbine aerodynamic performance at a plateau terrain in Kenya Article Full-text available May 2016 RENEW ENERG David Wekesa Cong Wang Ying-Jie Wei View. The wake is observed and examined by means of FFT analysis of pressure fluctuations at the point located downstream of the rotor. They highlighted the use of RANs for the development of vertical axis wind turbines based upon predicted results.. Modeling for the Aerodynamics Analysis of the Four Blades Movable Vanes Type Vertical Axis Wind Turbine (VVAWT) Article Full-text available Sep 2015 Kadhim Suffer G. A. Quadir Khairul Azwan Ismail Ryspek Uzobomatove View. Hence, the flow in the vertical direction was neglected, which is equivalent to 3D Savonius rotors with endplates. A Novel Parametric Modeling Method and Optimal Design for Savonius Wind Turbines Article Full-text available Mar 2017 Bo Li Baoshou Zhang Baowei Song Mao Zhaoyong Under the inspiration of polar coordinates, a novel parametric modeling and optimization method for Savonius wind turbines was proposed to obtain the highest power output, in which a quadratic polynomial curve was bent to describe a blade. Only two design parameters are needed for the shape-complicated blade. Therefore, this novel method reduces sampling scale. A series of transient simulations was run to get the optimal performance coefficient (power coefficient C p) for different modified turbines based on computational fluid dynamics (CFD) method. Then, a global response surface model and a more precise local response surface model were created according to Kriging Method. These models defined the relationship between optimization objective Cp and design parameters.

Particle swarm optimization (PSO) algorithm was applied to find the optimal design based on these response surface models. Finally, the optimal Savonius blade shaped like a “hook” was obtained. Cm (torque coefficient), Cp and flow structure were compared for the optimal design and the classical design. The results demonstrate that the optimal Savonius turbine has excellent comprehensive performance. The power coefficient Cp is significantly increased from 0.247 to 0.262 (6% higher). The weight of the optimal blade is reduced by 17.9%. View Show abstract. The steam required to drive the reforming reaction can be supplied by the anode recirculated stream. Alternatively, such steam can be produced externally, by using the heat of the exhaust gases. Conversely, atmospheric plants are easier to manage, due to the possibility of operate the SOFC and the GT independently one of each other. Golecha et al. 9 and Altan and Atilgan 10 placed a guide vane in front of the turbine to deflect flow for the returning blade. As for the novel blade shape design, McTavish et al. 11 proposed a modified blade shape and carried out both steady and transient computational fluid dynamics (CFD) simulations. Kamoji et al. 12 and Kacprzak et al. 13 studied the performance of modified turbines with spline-type and Bach-type blades, and an incensement of 16% in the efficiency was found in the case of using spline-type blades.. Effect of the blade arc angle on the performance of a Savonius wind turbine Article Full-text available May 2015 Zhaoyong Mao Wen-long Tian Savonius wind turbine is a common vertical axis wind turbine which simply comprises two or three arc-type blades and can generate power under poor wind conditions. With the aim of increasing the turbine’s power efficiency, the effect of the blade arc angle on the performance of a typical two-bladed Savonius wind turbine is investigated with a transient computational fluid dynamics method.

Simulations were based on the Reynolds Averaged Navier-Stokes equations, and the renormalization group turbulent model was utilized. The numerical method was validated with existing experimental data. The results indicate that the turbine with a blade arc angle of generates the maximum power coefficient, 0.2836, which is 8.37% higher than that from a conventional Savonius turbine. Since the main focus of the study is on VAWT unsteady inflow wind performance as a result of blade aerodynamic fluctuations, the preliminary tests for computational boundary have not been discussed in this paper. For full details on domain boundary location with both mesh and time step independence preliminary studies including the relevant assumptions made, the reader is referred to (and references therein Edwards et al., 2012;Danao et al., 2014; McTavish et al., 2013b; Gomez-Iradi et al., 2009).. Influence of operating conditions on unsteady wind performance of vertical axis wind turbines operating within a fluctuating free-stream: A numerical study Article Dec 2014 J WIND ENG IND AEROD David Wekesa Cong Wang Ying-Jie Wei Louis Danao View. A Computational Fluid Dynamics (CFD)-based method for capturing wind energy in a fluctuating free-stream, supported by analytical formulations, is investigated in this paper. We implemented unsteady Reynolds-Averaged Navier-Stokes (RANS) solver to control the dynamic mesh motion. Using an urban wind resource, characteristic fluctuation frequencies at 0.5 Hz, 1.0 Hz, and 2.0 Hz have been selected to demonstrate the enhanced wind energy capture. The numerical energy coefficient marginally changed from 0.36 at 0.5 Hz to 0.37 at both 1 Hz and 2 Hz cases. The results reveal that the highest frequency of fluctuation with meaningful energy content in unsteady wind condition is 1 Hz. The study findings promote our understanding about the energy associated with short-period fluctuations reflecting realistic unsteady wind environment.

Additionally, the present study approach to analyze wind energy capture on a H-Darrieus wind rotor in a fluctuating free-stream can be extrapolated to other slightly complex VAWT configurations. A two dimensional unsteady state analysis is carried out in this study. The unsteady Reynolds Averaged Navier-Stokes equation and the turbulence equation corresponding to SST k-.A grid independence study is performed to choose optimum mesh elements. The simulation is carried out and performance parameters like power coefficient and torque coefficient are calculated. The results are compared with the available experimental data for validation purpose and these matched with numerical values. An improved performance of around 37% Cp is observed for modified Bach type over simple Savonius rotor. Moreover, a brief analysis of flow behaviour over the rotor is studied. The rotation of the blades allows them to adapt to the varying angle of attack of the wind during one revolution of the platform. The important characteristic is the design feature that the blades are inclined outwards to the vertical axis of the platform by an angle of about 20 deg. The inclination leads to an increased circumferential velocity along the blade span, so that the increasing wind velocity with height can be better captured. Also the chord length of the blades increases with the spanwise position.In order to better utilize the wind flow, guide vanes can be arranged which increase the flow to those blades currently moving with the wind and in return flow can even give proper windshield.The articulated blades are connected to the horizontal platform via a special planetary bevel gear box, so that the relative rotational movement of them is controlled by the rotating platform, in fact a rotating gear box. This unit itself is connected to a generator thus producing electrical energy.