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#1 |
New Member
California
Join Date: Jan 2019
Posts: 15
Rep Power: 7 ![]() |
Hi,
When I went across the Non linear FSI tutorial, there is a residual output called RMS[R], which came from the domain RMS_RTOL I wonder what is the meaning of this residual. Its said that is the rms residual of residual vector. What is the physical meaning of residual vector. Specifically. When I was doing a coupled NL FSI, which is PDMS (cured silica) pillar in flow domain, I have convergence with : +-----------------------------------------------------------------------------+ | Zone 1 (Structure) | +-----------------------------------------------------------------------------+ | Inner_Iter| Load[%]| rms[U]| rms[R]| rms[E]| VonMises| +-----------------------------------------------------------------------------+ | 0| 100.00%| -10.895416| -3.815428| -19.498174| 4.1464e+00| | 1| 100.00%| -10.930047| -3.815428| -19.588986| 4.1464e+00| | 2| 100.00%| -11.084515| -3.815428| -19.884196| 4.1464e+00| | 3| 100.00%| -10.874983| -3.815428| -19.625737| 4.1464e+00| | 4| 100.00%| -9.117042| -3.815428| -16.155978| 4.1464e+00| | 5| 100.00%| -9.751613| -3.815430| -17.464259| 4.1464e+00| Which has very poor RMS R. I wonder what causes the problem and how can I improve that |
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#2 |
Senior Member
Pedro Gomes
Join Date: Dec 2017
Posts: 466
Rep Power: 13 ![]() |
Hi,
The physical meaning of the residual for nonlinear elasticity is nodal force imbalance. You need to look at it against its initial norm, not against the other two metrics. |
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#3 |
New Member
California
Join Date: Jan 2019
Posts: 15
Rep Power: 7 ![]() |
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Tags |
fsi, structural |
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