Dear Foamers,

I am performing some 2D simulations with fluctuating flow in a channel with an obstacle inside. What I do is having a fixed domain (the channel flow with the obstacle attached on the lower wall) with a timeVaryingUniformFixedValueBC at the inlet & outlet for the velocity. So far I performed my analyses using pimpleFoam and turbFoam.

Now I want to do something different. I don't want to use a fluctuating flow anymore as BC but I want to move the whole domain with a fluctuating velocity (same as flow velocity). Please note I don't want any deformation of the mesh.


Questions are:

which solver is optimal for this application?

Which boundary condition is required to simulate the motion of the whole domain?

Is there any example available which is similar to what I need?


Looking forward to your feedback,
Alessio

Here's a Sample Case Setup.

I use a solid body motion function. That's generally the way to move the mesh without any deformation. This function is defined in constant/dynamicMeshDict.

Use movingWallVelocity on the moving wall to set no slip. Otherwise things are pretty standard.

The solver is pimpleDyMFoam, but you could use interDyMFoam if you have a free surface flow.

And here's the custom solidBodyMotionFunction. You'll have to modify it if you want to specify a function that isn't native.

Its made for OpenFOAM®-1.6-ext, but it should compile without problems on 1.7.x. You're on your own for OpenFOAM®-2.0

Thanks Alton! It works perfectly. One more thing. If I want to apply a generic motion to the domain reading a data file (1 direction only is sufficient), is there any BC for that?

Cheers,
Alessio

Hi Alessio,

yes it is possible, look at timeVaryingUniformFixedValue BC

Regards

Norman