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How to calculate force in comsol dc discharge?
Posted Mar 27, 2017, 7:20 a.m. EDT Low-Frequency Electromagnetics, Plasma Physics Version 5.2 1 Reply
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Hi
I have successfully modeled a simple 2d dc discharge between two electrodes in comsol 5.2 and now I want to calculate the force applied by the discharge in the domain.
I chose "Force Calculation" from the domains and set a name for it but didn't change "torque axis" and "torque rotation point".
after computing, I tried to plot the force on a surface with the expression: DC Discharge(Electrostatics) >Mechanical >Electromagnetic force>z component
and i received the following errors:
Undefined variable.
- Variable: comp1.dc.unTz
- Geometry: geom1
- Boundaries: 1, 3-4
Failed to evaluate variable.
- Variable: comp1.dc.nTz_force
- Defined as: comp1.dc.unTz
Failed to evaluate expression.
- Expression: r*(pi*(2*comp1.dc.nTz_force))
Failed to evaluate expression.
- Expression: comp1.dc.intfcal1(r*(pi*(2*comp1.dc.nTz_force)))
Failed to evaluate variable.
- Variable: comp1.dc.Forcez_force
- Defined as: comp1.dc.intfcal1(r*(pi*(2*comp1.dc.nTz_force)))
Failed to evaluate expression.
- Expression: comp1.dc.Forcez_force
- Plot: surf1 (Surface)
======================
Can anyone please help me?
I have successfully modeled a simple 2d dc discharge between two electrodes in comsol 5.2 and now I want to calculate the force applied by the discharge in the domain.
I chose "Force Calculation" from the domains and set a name for it but didn't change "torque axis" and "torque rotation point".
after computing, I tried to plot the force on a surface with the expression: DC Discharge(Electrostatics) >Mechanical >Electromagnetic force>z component
and i received the following errors:
Undefined variable.
- Variable: comp1.dc.unTz
- Geometry: geom1
- Boundaries: 1, 3-4
Failed to evaluate variable.
- Variable: comp1.dc.nTz_force
- Defined as: comp1.dc.unTz
Failed to evaluate expression.
- Expression: r*(pi*(2*comp1.dc.nTz_force))
Failed to evaluate expression.
- Expression: comp1.dc.intfcal1(r*(pi*(2*comp1.dc.nTz_force)))
Failed to evaluate variable.
- Variable: comp1.dc.Forcez_force
- Defined as: comp1.dc.intfcal1(r*(pi*(2*comp1.dc.nTz_force)))
Failed to evaluate expression.
- Expression: comp1.dc.Forcez_force
- Plot: surf1 (Surface)
======================
Can anyone please help me?
1 Reply Last Post Mar 29, 2017, 4:00 a.m. EDT
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Posted:
8 years ago
I realized that the problem is connected to the maxwell stress tensor but I still cant find a way to fix it