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-   -   Couette Flow - The influence of viscosity (http://www.cfd-online.com/Forums/openfoam-solving/75738-couette-flow-influence-viscosity.html)

nuovodna May 4, 2010 07:10

Couette Flow - The influence of resolution and viscosity
 
Hi, i setted up a case of typic Couette flow trying to solve it with interFoam solver. Mesh generated with blockMesh (x_divisions = 20 y_divisions = 50). Changing the size of the mesh along the x axis (different x_divisions: 20 vs 40 vs 80) I obtain the same curve of U_Y in function of X coordinates when the flow is stabilized. The physical time necessary to reach the steady-state depends a lot on the discretization.
The steady state velocity profile results wrong, because it is different of the analytical solution.

. I tried to modify some fvSchemes params without success (gradScheme, interpolationScheme, laplacian(muEff) ). I defined nu and rho in transportProperties :
nu nu [ 0 2 -1 0 0 0 0 ] 0.066666667;
rho rho [ 1 -3 0 0 0 0 0 ] 1;
Acceleration force defined using file g in constant:
dimensions [0 1 -2 0 0 0 0];
value ( 0 1 0 );

Furthermore, I notice that changing the viscosity the convergence values of (U_Y_max - U_Y_analytical solution)/ U_Y_analytical solution) are still the same

vdapalma April 12, 2012 08:47

Why "interFoam"?
 
Why did you use "interFoam"? That is a solver for 2 incompressible, isothermal immiscible fluids using a VOF (volume of fluid) phase-fraction based interface capturing approac. I am working in a simular case with "icoFoam" in a model simple 2D Couette flow (1 flow).

Greetings

V. Da Palma


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