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Boundary system co-ordinates
Posted 01.10.2010, 04:03 GMT-4 2 Replies
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Hi,
I am having real difficulty applying a prescribed velocity using the boundary system. It seems to work ok when i apply a velocity in a direction in the global system, or a boundary load in both the boundary and global system but it won't work for a velocity.
Does anyone know why this is and if theres any way around it? I am using version 4.0a.
Thanks,
Chris
I am having real difficulty applying a prescribed velocity using the boundary system. It seems to work ok when i apply a velocity in a direction in the global system, or a boundary load in both the boundary and global system but it won't work for a velocity.
Does anyone know why this is and if theres any way around it? I am using version 4.0a.
Thanks,
Chris
2 Replies Last Post 04.10.2010, 03:49 GMT-4
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Posted:
1 decade ago
Hi
I assume you will get a better reply if you toild a little more, such as the equation you use, the boundaries, version and physics applied. In all generality, it's not evident to give a useful answer with your input.
--
Good luck
Ivar
I assume you will get a better reply if you toild a little more, such as the equation you use, the boundaries, version and physics applied. In all generality, it's not evident to give a useful answer with your input.
--
Good luck
Ivar
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Posted:
1 decade ago
Hi Ivar,
Physics type is solid mechanics. My model is, in short, a thin clinder (.405 mm diameter, 50mm long) bending over another cylinder (4mm diameter, 1 mm thick). Via contact pairs when I can get them to work.
Basically my problem is that when I apply a velocity to the two ends of the thin cylinder, the model (sometimes) works when I do it in the x direction but not the t1 boundary direction. I have tried simplifying this problem to see if i can get to the bottom of it by basically modelling just one cylinder, fixing one end and applying a velocity to the other and the same problem arises. I get the following error message.
Nonlinear solver did not converge.
Time : 0.0006250011920928956
Last time step is not converged.
On another note, with contact pairs, there is a default equation with the penalty function which is in orange...should I be put off by this? Im not sure if its causing further problems? Equation is...
min(1e-3*5^segiter, 1)*solid.E/solid.hmin_dst
Thanks again,
Chris
Physics type is solid mechanics. My model is, in short, a thin clinder (.405 mm diameter, 50mm long) bending over another cylinder (4mm diameter, 1 mm thick). Via contact pairs when I can get them to work.
Basically my problem is that when I apply a velocity to the two ends of the thin cylinder, the model (sometimes) works when I do it in the x direction but not the t1 boundary direction. I have tried simplifying this problem to see if i can get to the bottom of it by basically modelling just one cylinder, fixing one end and applying a velocity to the other and the same problem arises. I get the following error message.
Nonlinear solver did not converge.
Time : 0.0006250011920928956
Last time step is not converged.
On another note, with contact pairs, there is a default equation with the penalty function which is in orange...should I be put off by this? Im not sure if its causing further problems? Equation is...
min(1e-3*5^segiter, 1)*solid.E/solid.hmin_dst
Thanks again,
Chris