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

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

Hi Outi,

It's ok... it just means that the solver did not converge all the way... but the
resulting field is nonetheless sufficiently smooth.

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 5:11 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Solving mesh Laplace equation (Re: Mesh morphing)

Dear Paul,

Thank you very much, the idea seems exactly like what I would like to
do. However, there is an error appearing in the Helmholtz solver. From
logfile:

  call userchk
   1.000000000000000E-006  p22            0           1
      0   200 **ERROR**: Failed in HMHOLTZ: mshv   1.3206E-02
2.7147E+03   1.0000E-06
  done :: userchk

Best regards,
Outi

Quoting 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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