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issues with pre-stressed and initially-deformed problems
Posted 16.06.2010, 23:34 GMT-4 2 Replies
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Hi,
I am simulating the transient deflection of a simple cantilever beam under some constant load. It works fine.
In the next attempt I want to give an initial deflection before it undergoes the same external load.
But when I assign the initial deflection that has the same order of magnitude, in the following menu, no change to the solution is observed as if no initial condition was applied.
Physics > Subdomain Setting > Init
This has been of course my 2nd unsuccessful attempt in using initial values for a transient problem. In a Fluid-Structure interaction problem, the solid geometry was pre-stressed and I entered it in the Initial Stress-Strain tab.
Again nothing happened.
Does anyone have any idea how the initial values can work?
Thanks.
I am simulating the transient deflection of a simple cantilever beam under some constant load. It works fine.
In the next attempt I want to give an initial deflection before it undergoes the same external load.
But when I assign the initial deflection that has the same order of magnitude, in the following menu, no change to the solution is observed as if no initial condition was applied.
Physics > Subdomain Setting > Init
This has been of course my 2nd unsuccessful attempt in using initial values for a transient problem. In a Fluid-Structure interaction problem, the solid geometry was pre-stressed and I entered it in the Initial Stress-Strain tab.
Again nothing happened.
Does anyone have any idea how the initial values can work?
Thanks.
2 Replies Last Post 17.06.2010, 10:36 GMT-4
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Posted:
1 decade ago
Hi
have you checked how to restart your solver from previous run ?
I
n this way you make a first run to get the initial values, save the solution and restart from there.
By default, you restart from "initial conditions" often "zero", study the "solver manager tabs" in detail in 3.5.
In V4 you must try it out by steps to get he best out of the new way, I'm not fully operational there yet, having still some surprises, but I have tested sofar nice complex assemblies of studies, so the possibilities are going far beyond V3.5 in this new solver sequences approach
Have fun Comsoling
Ivar
have you checked how to restart your solver from previous run ?
I
n this way you make a first run to get the initial values, save the solution and restart from there.
By default, you restart from "initial conditions" often "zero", study the "solver manager tabs" in detail in 3.5.
In V4 you must try it out by steps to get he best out of the new way, I'm not fully operational there yet, having still some surprises, but I have tested sofar nice complex assemblies of studies, so the possibilities are going far beyond V3.5 in this new solver sequences approach
Have fun Comsoling
Ivar
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Posted:
1 decade ago
Thanks Ivar,
I had already seen your similar advice to someone else too and had implemented it (i.e. run as steady state
first then use the solution for transient solution) and it worked for me. But it would be intuitive more
if the initial stress-strain or initial deformation could work. So the question is that what are those INITIAL tabs for?
BTW, I am using v3.5.
Thanks again.
I had already seen your similar advice to someone else too and had implemented it (i.e. run as steady state
first then use the solution for transient solution) and it worked for me. But it would be intuitive more
if the initial stress-strain or initial deformation could work. So the question is that what are those INITIAL tabs for?
BTW, I am using v3.5.
Thanks again.