Computational fluid dynamics analysis of a modified Savonius rotor and optimization using response surface methodology

2017 ◽  
Vol 41 (5) ◽  
pp. 285-296 ◽  
Author(s):  
Haris Moazam Sheikh ◽  
Zeeshan Shabbir ◽  
Hassan Ahmed ◽  
Muhammad Hamza Waseem ◽  
Muhammad Zubair Sheikh
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Design Of Experiment ◽  
Coefficient Of Performance ◽  
Speed Ratio ◽  
Ansys Fluent ◽  
Computational Fluid Dynamics Analysis ◽  
Parametric Effects

This article aims to present a two-dimensional parametric analysis of a modified Savonius wind turbine using computational fluid dynamics. The effects of three independent parameters of the rotor, namely, shape factor, overlap ratio, and tip speed ratio on turbine performance were studied and then optimized for maximum coefficient of performance using response surface methodology. The rotor performance was analyzed over specific domains of the parameters under study, and three-variable Box-Behnken design was used for design of experiment. The specific parametric combinations as per design of experiment were simulated using ANSYS Fluent®, and the response variable, coefficient of performance (Cp), was calculated. The sliding mesh model was utilized, and the flow was simulated using Shear Stress Transport (SST) k − ω model. The model was validated using past experimental results and found to predict parametric effects accurately. Minitab® and ReliaSoft DOE++® were used to develop regression equation and find the optimum combination of parameters for coefficient of performance over the specified parametric domains using response surface methodology.

Study of Gas Shortcut Flow Rate in Cyclone with Different Inlet Section Angles Using Response Surface Methodology

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Fuping Qian ◽  
Xingwei Huang ◽  
Mingyao Zhang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Flow Rate ◽  
Numerical Solutions ◽  
Inlet Section ◽  
Statistical Software ◽  
Vortex Finder ◽  
Computational Fluid Dynamics Cfd

Numerical simulations of cyclones with various vortex finder dimensions and inlet section angles were performed to study the gas shortcut flow rate. The numerical solutions were carried out using commercial computational fluid dynamics (CFD) code Fluent 6.1. A prediction model of the gas shortcut flow rate was obtained based on response surface methodology by means of the statistical software program (Minitab V14). The results show that the length of the vortex finder insertion, the vortex finder diameter and the inlet section angle play an important role in influencing the gas shortcut flow rate. The gas shortcut flow rate decreases when increasing the inlet section angle, and increases when increasing the vortex finder diameter and decreasing the length of the vortex finder insertion. Compared with the effect of the length of the vortex finder insertion on the shortcut flow rate, the effect of the vortex finder diameter on the gas shortcut flow rate seems more pronounced. The effect of the vortex finder dimension on the gas shortcut flow rate is changed with the different inlet section angles, i.e., the effects of the vortex finder dimension of the conventional cyclone (the inlet section angle is 0º) on the gas shortcut flow rate is stronger than the cyclone with 30º and 45º inlet section angles.

scholarly journals A Computational Fluid Dynamics Analysis of an Ideal Anguilliform Swimming Motion

2017 ◽  
Vol 51 (6) ◽  
pp. 21-32
Author(s):  
Brandon M. Taravella ◽  
Charles T. Rogers
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluid Velocity ◽  
The Body ◽  
Current Work ◽  
Ansys Fluent ◽  
Induced Drag ◽  
Swimming Motion ◽  
Computational Fluid Dynamics Analysis ◽  
Body Formulation

AbstractResearchers have been studying swimming motions of various fishes for numerous years. The scope of the current work is to validate the results of an ideal anguilliform swimming motion developed by Vorus and Taravella (2011) by modeling the motion in a commercially available Computational Fluid Dynamics (CFD) code. The ideal swimming motion developed by Vorus and Taravella (2011) shows that thrust can be generated by an anguilliform swimmer without producing wake-induced drag. In the current work, ANSYS Fluent was used to discretize and solve Euler's equation and the continuity conservation. The results for fluid velocity on the body of the anguilliform show an average agreement within ±3% to the potential flow slender body formulation of Vorus and Taravella (2011). There is also no induced circulation in the wake of the anguilliform in the CFD solution, which confirms the absence of wake-induced drag. The results suggest that it is plausible for an undulating body to produce thrust that is purely inertial and is produced by body accelerations acting through hydrodynamic added mass.

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