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global variable definitions in Ver4.0
Posted Jul 28, 2010, 9:53 p.m. EDT 3 Replies
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I built a electrostatics model in comsol Ver3.5. It works well. Then I open it in Ver4.0, and I found it has a error when computing a pre-defined global variables. I notice the definition is different from Ver3.5, so I change the expression to "mod1.emes.epsilon0*(mod1.emes.normE)^2*(mod1.emes.epsilonr-1)*(mod1.emes.epsilonr+2)/6",as shown in the following, but it still seems has a problem.
Can anybody know how to fix it?
global definitions variables 1
electrostatics (emes)
P=mod1.emes.epsilon0*(mod1.emes.normE)^2*(mod1.emes.epsilonr-1)*(mod1.emes.epsilonr+2)/6
Can anybody know how to fix it?
global definitions variables 1
electrostatics (emes)
P=mod1.emes.epsilon0*(mod1.emes.normE)^2*(mod1.emes.epsilonr-1)*(mod1.emes.epsilonr+2)/6
3 Replies Last Post Aug 3, 2010, 3:34 a.m. EDT
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Posted:
1 decade ago
Hi
thenaming has changes quite a lot between the two COMSOL versions, so I'm not astonished that one get translation errors (Comsol is also improving their translators, so this issue might be solved with newer releases).
I can only suggest to you to turn on the equations in V4 (options preferences) and analyse deeper into the formulas, the naming convention o the id tags (1,2,3) might have changed or been wrongly asserted
--
Good luck
Ivar
thenaming has changes quite a lot between the two COMSOL versions, so I'm not astonished that one get translation errors (Comsol is also improving their translators, so this issue might be solved with newer releases).
I can only suggest to you to turn on the equations in V4 (options preferences) and analyse deeper into the formulas, the naming convention o the id tags (1,2,3) might have changed or been wrongly asserted
--
Good luck
Ivar
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Posted:
1 decade ago
Hi,
The correct expression in 4.0, for a global variable, with the default identifiers mod1 for Model 1 and es for Electrostatics is
epsilon0_const*(mod1.es.normE)^2*(mod1.es.epsilonr-1)*(mod1.es.epsilonr+2)/6
Notice that epsilon0 is a predefined physical constant and is always available using the _const suffix.
If you define the variable inside Model 1, the "mod1." part is not needed.
Best regards,
Magnus RIngh
COMSOL
The correct expression in 4.0, for a global variable, with the default identifiers mod1 for Model 1 and es for Electrostatics is
epsilon0_const*(mod1.es.normE)^2*(mod1.es.epsilonr-1)*(mod1.es.epsilonr+2)/6
Notice that epsilon0 is a predefined physical constant and is always available using the _const suffix.
If you define the variable inside Model 1, the "mod1." part is not needed.
Best regards,
Magnus RIngh
COMSOL
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Posted:
1 decade ago
Hei Magnus
In fact you could add a column in the table in the doc with the constants, giving their correct complete name (with the "_const" suffix). I find the table slighly confusing since "epsilon0" is the physicsl name but "epsilon0_const" is the COMSOL name to use. Only the wording in the sentence above is somewhat misleading. But once you have understood its all obvious, but it took me some ime to "understand" ;)
--
Have a nice day
Ivar
In fact you could add a column in the table in the doc with the constants, giving their correct complete name (with the "_const" suffix). I find the table slighly confusing since "epsilon0" is the physicsl name but "epsilon0_const" is the COMSOL name to use. Only the wording in the sentence above is somewhat misleading. But once you have understood its all obvious, but it took me some ime to "understand" ;)
--
Have a nice day
Ivar