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Where should I put constraint
Posted 19 ott 2012, 07:12 GMT-4 1 Reply
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Hi All,
I'm not sure where I should put constraint or maybe I should use prescribed displacement in my model?
My model (in attachment):
I calculate the stationary state then I use stationary calculations as initial conditions for time depending study and I changed heat transfer coefficient because I assumed that steel surface starts to be cooled by water. But my thermal stresses looks falsely.
Should I use first principal stress or von Mises stress in presentation of results?
Why I get a negative value of stress?
Thank you for any insight,
Robert
I'm not sure where I should put constraint or maybe I should use prescribed displacement in my model?
My model (in attachment):
I calculate the stationary state then I use stationary calculations as initial conditions for time depending study and I changed heat transfer coefficient because I assumed that steel surface starts to be cooled by water. But my thermal stresses looks falsely.
Should I use first principal stress or von Mises stress in presentation of results?
Why I get a negative value of stress?
Thank you for any insight,
Robert
Attachments:
1 Reply Last Post 19 ott 2012, 09:21 GMT-4
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Posted:
1 decade ago
Hi
I suppose the effect comes from the Roller condition in the middle of the model, I would haver expected that condition on Boundary "5"
then use rather a time stepping of the type: as heat diffusion has a nice decay
2^{range(-1,0.5,10)}
then your slot is not really physical, as with these temperature the two bricks will exchange heat, but that is probably OK as a first approach
As I cannot really understand what is fixed and what is rigid here it's difficult to suggest something
--
Good luck
Ivar
I suppose the effect comes from the Roller condition in the middle of the model, I would haver expected that condition on Boundary "5"
then use rather a time stepping of the type: as heat diffusion has a nice decay
2^{range(-1,0.5,10)}
then your slot is not really physical, as with these temperature the two bricks will exchange heat, but that is probably OK as a first approach
As I cannot really understand what is fixed and what is rigid here it's difficult to suggest something
--
Good luck
Ivar