[Ali Blues]

Hi,
I had a look at the tutorial in foam-extend 3.2 for the case of oscillating cylinder in a channel (movingCylinderInChannelIco) using the immersed boundary method.

Now imagine that i have a square instead of a cylinder and i only want to rotate the square about the out of the plane axis, without any translation. Now I think I can make use of the GGI approach and enclose the square in a "rotating Zone". But that kind of spoils the whole idea of using IBM.

So looking at available solid body motion solvers in src/dynamicMesh/meshMotion/solidBodyMotion/ it seems I could use the rotatingOscillation motion solver. I'll give it a shot. Let's see how it goes.

Ali

[RobertG]

Originally Posted by Ali Blues

Hi,
I had a look at the tutorial in foam-extend 3.2 for the case of oscillating cylinder in a channel (movingCylinderInChannelIco) using the immersed boundary method.

Now imagine that i have a square instead of a cylinder and i only want to rotate the square about the out of the plane axis, without any translation. Now I think I can make use of the GGI approach and enclose the square in a "rotating Zone". But that kind of spoils the whole idea of using IBM.

So looking at available solid body motion solvers in src/dynamicMesh/meshMotion/solidBodyMotion/ it seems I could use the rotatingOscillation motion solver. I'll give it a shot. Let's see how it goes.

Ali

Hello,
You have to write your owen rotation Function. Based on the oscillation... Function at the movingIB tutorial, it should not be that complicated. I was a beginner when I did it and it tock me only 1 h. (OpenFoam has already one, but it is more easy to write your owen based on the oscillation... Function then make the one of OF work).
Just adapt the translate part, make the rotation matrix dependent to the simulation time and adapt the variables which are read at the dynamicMeshDict

Hope that helps

RobertG

[YatengQ]

Hi Robert,

Sorry to bother you, I wonder how to define the self-motion function based on the rotatingOscillation.C.

You say movingIB tut, I can't find it, can you explain in more details?

PS:you mean I need to define the rotation motion by creat the "myrotation.C" & "myrotation.H"?

I'm new in IBM, maybe these questions are simple enough..........

Thanks!
B.W.

YT.Q