Damping in StressSolver

Numerical methods and mathematical models of Elmer
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kevinarden
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Damping in StressSolver

Post by kevinarden » 24 Apr 2019, 15:16

Running an undamped versus damped case. The undamped ELmer solution compares very well to Abaqus.
undamped.PNG
undamped.PNG (86.99 KiB) Viewed 230 times
abaqus in blue elmer in orange

The damped case the abaqus solution ehibits damping, but Elmer did not. Is there something missing in the sif?
damped.PNG
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damped.sif
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kevinarden
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Re: Damping in StressSolver

Post by kevinarden » 24 Apr 2019, 18:07

Meant to post mesh as well. .1 x .1 x 1 meter beam fixed at both ends. Apply 200 MPa for 0.1 seconds then let beam vibrate freely.
beam.zip
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kevinarden
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Re: Damping in StressSolver

Post by kevinarden » 24 Apr 2019, 19:49

The time step data used 500 intervals, the sif file posted only has 2.

mika
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Re: Damping in StressSolver

Post by mika » 26 Apr 2019, 17:00

Hi,

Unfortunately there were some bugs in the code which should now be fixed. Could you update to the newest (devel) version and try again? Thanks for reporting about this trouble,

Mika

kevinarden
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Re: Damping in StressSolver

Post by kevinarden » 26 Apr 2019, 23:02

Will do

Kevin

kevinarden
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Re: Damping in StressSolver

Post by kevinarden » 29 Apr 2019, 01:48

Results look good
damped.png
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kevinarden
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Re: Damping in StressSolver

Post by kevinarden » 29 Apr 2019, 14:46

Elmer damped compared to ABAQUS damped
damped.PNG
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raback
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Re: Damping in StressSolver

Post by raback » 13 May 2019, 21:32

Kevin, nice work in the verification! _peter

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