New to OpenFoam

Phizz82 · June 19, 2013, 17:45

Hi there!

I have just started with OpenFoam (and CFD in general) and am currently trying to kickstart my project with what I thought would be a simple modelling of a control volume simulating the freestream at 11,000m and Mach 0.85 for use with a mesh further on with a wing and nacelle in the control volume. However, having worked with icoFoam, I believe that due to the high reynolds numbers this is probably not going to work. A university colleague recommended that I uses a solver that uses a k-epsilon model of turbulence to keep my simulations from taking forever on my home computer (this is part of a distance learning course), Can anyone recommend a solver that would fit the job for me please?

Boundary conditions:
p = 22.6kPa
ro = 0.42kgm^-3
U = 234.22ms^-1
nu = 4.05x10^-5

simt · June 20, 2013, 03:00

Are you supposed to take compressible effects into account? Then rhoPimpleFoam or sonicFoam, but I think you can expect difficulties to achieve convergence.

Suitable incompressible solver is simpleFoam, there is even an airfoil2d tutorial case with this solver in the OF package.

Phizz82 · June 20, 2013, 05:51

Thanks Simt. I will probably start with the incompressible solver just due to lack of time and memory ( I have an i7 3570K and 16GB of RAM but not an industry standard computer). My brief is to model the flow around two similar products ( I am modelling the flow around a wing with under, over and in wing configurations of engine nacelle) so if I have the time I will look into simulating with compressibility.

Will the values of k and epsilon used for the 2D simulation in simpleFoam be sufficient for a full 3D simulation?

June 19, 2013, 17:45	New to OpenFoam	#1
Phizz82 New Member Philip Brown Join Date: Jun 2013 Posts: 25 Rep Power: 12	Hi there! I have just started with OpenFoam (and CFD in general) and am currently trying to kickstart my project with what I thought would be a simple modelling of a control volume simulating the freestream at 11,000m and Mach 0.85 for use with a mesh further on with a wing and nacelle in the control volume. However, having worked with icoFoam, I believe that due to the high reynolds numbers this is probably not going to work. A university colleague recommended that I uses a solver that uses a k-epsilon model of turbulence to keep my simulations from taking forever on my home computer (this is part of a distance learning course), Can anyone recommend a solver that would fit the job for me please? Boundary conditions: p = 22.6kPa ro = 0.42kgm^-3 U = 234.22ms^-1 nu = 4.05x10^-5

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June 20, 2013, 03:00		#2
simt Member Join Date: Apr 2013 Posts: 32 Rep Power: 13	Are you supposed to take compressible effects into account? Then rhoPimpleFoam or sonicFoam, but I think you can expect difficulties to achieve convergence. Suitable incompressible solver is simpleFoam, there is even an airfoil2d tutorial case with this solver in the OF package.

June 20, 2013, 05:51		#3
Phizz82 New Member Philip Brown Join Date: Jun 2013 Posts: 25 Rep Power: 12	Thanks Simt. I will probably start with the incompressible solver just due to lack of time and memory ( I have an i7 3570K and 16GB of RAM but not an industry standard computer). My brief is to model the flow around two similar products ( I am modelling the flow around a wing with under, over and in wing configurations of engine nacelle) so if I have the time I will look into simulating with compressibility. Will the values of k and epsilon used for the 2D simulation in simpleFoam be sufficient for a full 3D simulation?