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Need some help in meshing, inverted mesh elements warnings

Posted 27.03.2012, 05:23 GMT-4 Fluid & Heat, Microfluidics Version 4.2a 2 Replies

Jaap Verheggen
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I have an FSI problem, by moving a membrane I would like to see the fluid move.

When I setup the simulation, I've played around with the settings, looked at how other models were setup, but I can't get rid of the 'inverted mesh elements' warnings.

Does anyone have any advice on this model?

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2 Replies Last Post 18.05.2012, 12:42 GMT-4
COMSOL Moderator

Hello Jaap Verheggen

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Daniel Eduardo Araya Luna
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Posted: 1 decade ago 17.05.2012, 20:46 GMT-4
Hi!!

As far as I know, that warning happens when you are using a coarse mesh (for a particular problem o model) if you use a finer o extremely finer mesh it is probably works,

Have you tried?

I hope it can help you.
Hi!! As far as I know, that warning happens when you are using a coarse mesh (for a particular problem o model) if you use a finer o extremely finer mesh it is probably works, Have you tried? I hope it can help you.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 18.05.2012, 12:42 GMT-4
Hi

why not use a boundary mash on all no-slip walls ? if you used the default COMSOL fluid mesh I believ it would work, have you tried that (but Im in pached 4.2a could be better implemented than in your older 4.2

furthermore, for a waveform oscillation you shoul impose a strict or intermediate time stepping, the "default automatic/free might start to skip part of your waveform shape

Finally the way you have defined your model there is no fixed point for the pressure, try adding an external point pressure value of 0 Pa (or two)

that was for the "theory" still its not running for me. I then added a stationry solver sequence before the time series and added a Parameter t = 0[s] and I see nothing, so I tweaked the funcions such to have a little load at t=0 still I get a deformation of the structure, but no coupling to the fluid so there must be something funny there in the ALE set-up

--
Good luck
Ivar
Hi why not use a boundary mash on all no-slip walls ? if you used the default COMSOL fluid mesh I believ it would work, have you tried that (but Im in pached 4.2a could be better implemented than in your older 4.2 furthermore, for a waveform oscillation you shoul impose a strict or intermediate time stepping, the "default automatic/free might start to skip part of your waveform shape Finally the way you have defined your model there is no fixed point for the pressure, try adding an external point pressure value of 0 Pa (or two) that was for the "theory" still its not running for me. I then added a stationry solver sequence before the time series and added a Parameter t = 0[s] and I see nothing, so I tweaked the funcions such to have a little load at t=0 still I get a deformation of the structure, but no coupling to the fluid so there must be something funny there in the ALE set-up -- Good luck Ivar

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