# Modeling 2d Savonius rotor

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 September 17, 2008, 07:23 Modeling 2d Savonius rotor #1 D_Lichu Guest   Posts: n/a Hi all, I need help in modeling simple 2d Savonius rotor. I'm new user to Fluent so I would be grateful if someone could answer my questions. The construction in my simulation - 2 semicircles connected at one edge (without any offset). Something like that: ( ) <- wall Boundries are far away from construction (had problem with reversed flow). Fluid - air (outdoor). Velocity (form velocity_inlet) 10 m/s in X axis, 0 in Y axis. Triangle mesh used. I used Inviscid, Spalart-Allmaras and k-epsilon model with standard variables. Discretization for pressure - PRESTO!, all other - Secend Order Upwind. SIMPLE What is my main problem? Simulation never reaches convergence (all criteria on e-6 <- read in one tutorial)... Even after 10 000 iterations. So my question is: a) what is the best model and discretization settings for simulation like this? (accurate) b) what must I do to obtain criteria? or should I change criteria? (if so, to what number?) c) when I simulate with k-epsilon model I get something like that: turbulent viscosity limited to viscosity ratio of 1.000000e+020 in 20 cells (I changed limit range and still get that error) All above I made with static walls as rotor. And one last thing - very important. How to make walls spin (rotation axis in center) when wind flow is simulated? Need to change something back in Gambit model? Please F1. D_Lichu

 August 20, 2010, 10:56 #3 New Member   filip Join Date: Aug 2010 Posts: 1 Rep Power: 0 how exactly do you define a "interface" of this two surfaces? im new at this...also making savonius wind turbine and have huge problems making a model in fluent that rotates

 August 23, 2010, 01:06 #4 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,160 Rep Power: 32 the interfaces have to be disconnected (2 surfaces superposed). One belong to the stator volume, the other belongs to the rotor volume __________________ In memory of my friend Hervé: CFD engineer & freerider

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