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Time Dependent model
Posted Jan 29, 2012, 12:24 p.m. EST Structural Mechanics Version 4.2a 1 Reply
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Hello,
I m trying to run a simple time dependent model where i m streching a rectangular plate with an edge load defined as '800[N/m*s]*t[s]'. Unfortunately, i get this error:
Failed to evaluate operator Jacobian.
Failed to evaluate operator Jacobian.
- Operator: mean
- Geometry: 1
- Boundary: 1
Mean operator requires an adjacent domain of higher dimension.
Can anyone please help?
thx
I m trying to run a simple time dependent model where i m streching a rectangular plate with an edge load defined as '800[N/m*s]*t[s]'. Unfortunately, i get this error:
Failed to evaluate operator Jacobian.
Failed to evaluate operator Jacobian.
- Operator: mean
- Geometry: 1
- Boundary: 1
Mean operator requires an adjacent domain of higher dimension.
Can anyone please help?
thx
1 Reply Last Post Jan 29, 2012, 2:01 p.m. EST
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Posted:
1 decade ago
Hi
without the odel it's difficult to tell, it has to do with the equation you have defined, that Comsol cannot derive to get a Jacobian, but the rest about "mean" (that is probably used internally to get some other COMSOL variable) could indicate a geoemtry coherence issue
by the way i suppose your eqution in the GUi is something like
800[N/m]*t[1/s] or 800[N/m/s]*t
as by default with a time dependent solver "t" is already defined with units of seconds so its not required in the equation field. But I agree its coherent to write it out like you did here on the FORUM to allow us to udnertand the true units of the variables
One point remains I would have expected N/m^2 for a boundary load (even in 2D as there its for 1[m] default depth for the 3rd implicit dimension
--
Good luck
Ivar
without the odel it's difficult to tell, it has to do with the equation you have defined, that Comsol cannot derive to get a Jacobian, but the rest about "mean" (that is probably used internally to get some other COMSOL variable) could indicate a geoemtry coherence issue
by the way i suppose your eqution in the GUi is something like
800[N/m]*t[1/s] or 800[N/m/s]*t
as by default with a time dependent solver "t" is already defined with units of seconds so its not required in the equation field. But I agree its coherent to write it out like you did here on the FORUM to allow us to udnertand the true units of the variables
One point remains I would have expected N/m^2 for a boundary load (even in 2D as there its for 1[m] default depth for the 3rd implicit dimension
--
Good luck
Ivar