Hi Mike, A grep in the examples folder under the Nek repository gave me the example 'fs_hydro' as a comparable case. I'd also take a look at the primer http://www.mcs.anl.gov/~fischer/primer.pdf in particular page 16. You would probably need different boundary conditions since these cases are free surface cases but maybe you can tweak something to get started. I am not sure if time dependency for the boundary is covered in any of these examples but you can implement the time advancement in the user file using the same time step as the solver. Good luck and let us know how it goes, Oana ________________________________________ From: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Tuesday, October 07, 2014 8:34 AM To: [email protected] Subject: Re: [Nek5000-users] Moving Wall Advice Hello all, I have not seen any response on this -- anyone have some thoughts they'd like to share? Cheers, Mike On Oct 3, 2014, at 1:36 PM, <[email protected]> <[email protected]> wrote:

Hello Neks,

I'm trying to simulate a flow where one of the boundaries is moving in a manner that requires the mesh to deform as a function of time. In short, the conditions of the flow will determine how the boundary moves (it's a fluid-structure interaction problem, but the structure is a rigid body suspended in the fluid).

Are there any available examples that would provide guidance?

If not, does anyone out there want to share some wisdom? For example, I understand that I will need IFMVBD = True, and I will need "mv" boundary conditions specified in the .rea file, but in which routine should I modify the mesh node locations and velocities?

I found a similar question in the archive under the subject "what parameters for a moving wall induced velocity problem?" but there didn't seem to be any follow-up responses.

Thanks in advance.

Cheers, Mike

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Paul, Oana -- thanks for the tips. The ocyl example seems very close to what I need. One question: Will the ALE formulation as currently implemented work if I'm solving a 2D axisymmetric-flow problem (where the temperature is used to represent the azimuthal flow component)? Thanks again, Mike On Oct 7, 2014, at 8:08 AM, <[email protected]> wrote:

Hi Mike,

There is also the ocyl example, which has an oscillating cylinder.

Paul

________________________________________ From: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Friday, October 03, 2014 2:36 PM To: [email protected] Subject: [Nek5000-users] Moving Wall Advice

Hello Neks,

I'm trying to simulate a flow where one of the boundaries is moving in a manner that requires the mesh to deform as a function of time. In short, the conditions of the flow will determine how the boundary moves (it's a fluid-structure interaction problem, but the structure is a rigid body suspended in the fluid).

Are there any available examples that would provide guidance?

If not, does anyone out there want to share some wisdom? For example, I understand that I will need IFMVBD = True, and I will need "mv" boundary conditions specified in the .rea file, but in which routine should I modify the mesh node locations and velocities?

I found a similar question in the archive under the subject "what parameters for a moving wall induced velocity problem?" but there didn't seem to be any follow-up responses.

Thanks in advance.

Cheers, Mike

_______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users _______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users