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error in the model of a coax
Posted 11 juil. 2012, 14:37 UTC−4 Low-Frequency Electromagnetics 1 Reply
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Hi,
I'm a newbie on comsol, trying to model in ac/dc module and electromagnetics.
I started to work with a simple coax cable structure, examined the capacitance wrt radius of insulator as well as different different types of insulators in electrostatics physics. Then studied the tutorial on the empedance of a coax cable.
Now, what I want to is to apply an ac voltage to its conductors and see how it behaves.
However I couldn't do it. First, I solved the problem in time domain of electrostatics and electric currents separately, as seting the terminal voltage a function depended on time, i.e. Vo*sin(2*pi*f*t).
When those did not work, I switched to the freq.domain in electric currents. However, that did not work, either.
This is the error I'm getting,
"
Problem encountered during results while solving.
Evaluation of result expression failed.
Failed to evaluate variable.
- Variable: es.nD
- Geometry: 1
- Boundary: 6 7 8 9 10 11 26 27 28 42 43 44
Failed to evaluate expression.
- Expression: real(es.nD)
Failed to evaluate expression.
- Expression: real(es.nD)
"
What might be the problem?
thanks a lot
CBD
I'm a newbie on comsol, trying to model in ac/dc module and electromagnetics.
I started to work with a simple coax cable structure, examined the capacitance wrt radius of insulator as well as different different types of insulators in electrostatics physics. Then studied the tutorial on the empedance of a coax cable.
Now, what I want to is to apply an ac voltage to its conductors and see how it behaves.
However I couldn't do it. First, I solved the problem in time domain of electrostatics and electric currents separately, as seting the terminal voltage a function depended on time, i.e. Vo*sin(2*pi*f*t).
When those did not work, I switched to the freq.domain in electric currents. However, that did not work, either.
This is the error I'm getting,
"
Problem encountered during results while solving.
Evaluation of result expression failed.
Failed to evaluate variable.
- Variable: es.nD
- Geometry: 1
- Boundary: 6 7 8 9 10 11 26 27 28 42 43 44
Failed to evaluate expression.
- Expression: real(es.nD)
Failed to evaluate expression.
- Expression: real(es.nD)
"
What might be the problem?
thanks a lot
CBD
1 Reply Last Post 12 juil. 2012, 15:39 UTC−4
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Posted:
1 decade ago
Hi again,
I managed my problem, solved it. However now I have a different problem.
I designed a model with a semi-conductor sphere and studied the currents flown on the surface with ec physics. When I add an air around the sphere, that did not work simply. The program couldn't calculate.
What might be the problem?
thanks,
Ceren
I managed my problem, solved it. However now I have a different problem.
I designed a model with a semi-conductor sphere and studied the currents flown on the surface with ec physics. When I add an air around the sphere, that did not work simply. The program couldn't calculate.
What might be the problem?
thanks,
Ceren