[Nek5000-users] Solving mesh Laplace equation (Re: Mesh morphing)

[nek5000-users at lists.mcs.anl.gov]

Dear Outi,

I have just added "ocyl2" to the ocyl example directory.

I think it addresses the question you raise.  Please advise and let
us know if you have any difficulties.

Paul

________________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
Sent: Friday, February 20, 2015 11:39 AM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] Solving mesh Laplace equation (Re: Mesh morphing)

Dear Neks,

What I actually would like to accomplish is to solve the Laplace
equation for the mesh (with the boundary deformation as a BC). I saw
that this has been done already at least by Paul (a thread 2009) and
Matt (for smoothing of a wing mesh, with zero deformation).
Could any of you please give me a hint on how to solve the Laplace
equation for the mesh like this? Matt? Paul?
I would be very grateful.

Best regards,
Outi

Quoting Outi Tammisola <outi at mech.kth.se>:

> Dear Neks,
>
> I thought this question might be of interest for someone else as
> well, so posting it here:
>
> I have been looking at the oscillating cylinder example. I would
> like to do something similar, but instead of a prescribed boundary
> velocity, would like to prescribe a given displacement of one
> boundary, and morph my mesh smoothly everywhere to match this
> displacement. For example, if one were to describe a deformation of
> the cylinder rather than a velocity (but without altering the other
> boundaries and without scaling the mesh). This just needs to be done
> once, not at every time step.
>
> Is there an easy way to do this? Can I arrive there somehow by minor
> modifications of the elasticity solver? What equation exactly is the
> elasticity solver solving at every time step?
> (When I outputted the files after every time step for the
> oscillating cylinder, the mesh deformation seemed to match the
> prescribed one only after 2 time steps. Is there a reason for this,
> or did I do something wrong?)
>
> Best regards,
> Outi


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