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time dependent coupled thermal structural with slow & fast pressure & thermal pulses.
Posted Jan 2, 2013, 6:52 p.m. EST 1 Reply
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I ran a time dependent coupled thermal-structural problem with temperature dependent structural and thermal properties. When the thermal and pressure pulses were ramped up over two seconds no problem.
Identical problem but only over 5 ms for both pulses. Problem only goes to 3.5 ms and then explodes. Any suggestions?
Thanks,
--
Arthur Rupel
Identical problem but only over 5 ms for both pulses. Problem only goes to 3.5 ms and then explodes. Any suggestions?
Thanks,
--
Arthur Rupel
1 Reply Last Post Jan 3, 2013, 2:25 a.m. EST
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Posted:
1 decade ago
Hi
have you checked your termal gradient at initial t=0 ? and do your mesh correctly resolve the gradients ? This is often forgotten or overlooked and might make the solver fail.
I often runa stationary case to get a coherehnt starting point, then run the time series, or I start from a well known temperature profile and I ramp up (smoothed step operator) the BC flux items
--
Good luck
Ivar
have you checked your termal gradient at initial t=0 ? and do your mesh correctly resolve the gradients ? This is often forgotten or overlooked and might make the solver fail.
I often runa stationary case to get a coherehnt starting point, then run the time series, or I start from a well known temperature profile and I ramp up (smoothed step operator) the BC flux items
--
Good luck
Ivar