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May 18, 2013, 04:39 |
pseudo transient
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#1 |
Member
Lagunesvary
Join Date: Apr 2013
Location: Malaysia
Posts: 40
Rep Power: 13 |
Hai, as i choosing coupled solver in solution method.. why there is no pseudo transient option for me..??
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September 9, 2013, 08:51 |
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#3 |
Member
Ali.E
Join Date: Sep 2010
Location: Lisboa
Posts: 83
Rep Power: 15 |
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September 9, 2013, 10:35 |
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#5 |
Senior Member
Jamal Foroozesh
Join Date: Oct 2012
Location: Iran
Posts: 162
Rep Power: 13 |
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September 9, 2013, 11:57 |
what exactly is meant by pseudo transient?
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#6 |
New Member
Tamara Annabelle
Join Date: Jul 2013
Posts: 26
Rep Power: 12 |
Hello tehre!
I have a general question. I have to simulate a transient model. So far I just copied the settings of the precedent student working on that model. He enabled the "pseudo transient" option in the solution methods settings. What does the option "pseudo transient" mean resp. what does it cause/effect in the calculation? Thanks so far, I would appreciate your answers! |
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September 9, 2013, 12:21 |
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#7 | |
Senior Member
Jamal Foroozesh
Join Date: Oct 2012
Location: Iran
Posts: 162
Rep Power: 13 |
Quote:
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September 9, 2013, 12:26 |
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#8 |
Super Moderator
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It is like solving the problem with high gradient and initially unstable solution (and ultimately steady state and stable solution) with unsteady solver and choosing bigger time step. In this way the initial transients (non-physical) will wash away and you will get a very nice convergence.
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September 10, 2013, 04:56 |
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#9 |
Senior Member
duri
Join Date: May 2010
Posts: 245
Rep Power: 16 |
Pseudo transient solves the unsteady equation with time stepping calculated from large scale domain information rather local cell information. And same time step is applied to all cells exactly like global time stepping. The main advantage is that convergence acceleration occurs in regions of mesh induced stiffness. (like boundary layer)
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March 20, 2014, 15:41 |
Pseudo transient time step in unsteady problem
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#10 |
Senior Member
Tanjina Afrin
Join Date: May 2013
Location: South Carolina
Posts: 169
Rep Power: 12 |
Hello everyone.
For my 3D unsaturated porous media model, I am using VOF. Water level will change with time and after some time it will become steady. So initially it is unsteady. For saving time, I used steady time step with pseudo transient option. Water level was falling perfectly, after some time it became steady also. I just want to make myself sure that for unsteady model like this, I can use steady time with pseudo transient option. I was going through the literature available for pseudo-transient time step, but I kinda lost. Then I found this thread. Could anyone please help me in this regard? Thanks in advance. Regards, Tanjina |
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