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quick help please! electrostatic module
Posted 14 mar 2011, 06:47 GMT-4 Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions 3 Replies
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is there possible to change the temperature in electrostatic without adding a new model?
i am working with electrodes and i need to find out if the temperature changes the field line.
please i need urgent help
i am working with electrodes and i need to find out if the temperature changes the field line.
please i need urgent help
3 Replies Last Post 14 mar 2011, 09:22 GMT-4
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Posted:
1 decade ago
Hi
what phenomena should be temperature dependent in ES ? I must assume (as you do not tell) its i.e. a material constant. If the temperature is constant in the full model (or domain OR you can express it as a simple analytiacl function T(x,y,z) then YES you can:
Define a temperature PARAMETER as T or T0
define a function "ana1()" that maps this temperature over the field
call the material parameter with a T0*ana1(x,y,z)
Note: when you write just "T" in HT for the temperature you are in fact calling for the field T(x,y,z) (in 3D) but COMSOL assumes by default this (x,y,z) dependence and you do no write it out fully. with an analytical function you must do it.
This means that the ana1(x,y,z) will take x,y,z values from the operation (integration scan over entity linked to the way the formula is used inside COMSOL. (not sure I made myself clear now, hope so ;)
PS that was fr V4, for v3.5 you need t use a function call instead of the "ana1()" term, but it's the same
--
Good luck
Ivar
what phenomena should be temperature dependent in ES ? I must assume (as you do not tell) its i.e. a material constant. If the temperature is constant in the full model (or domain OR you can express it as a simple analytiacl function T(x,y,z) then YES you can:
Define a temperature PARAMETER as T or T0
define a function "ana1()" that maps this temperature over the field
call the material parameter with a T0*ana1(x,y,z)
Note: when you write just "T" in HT for the temperature you are in fact calling for the field T(x,y,z) (in 3D) but COMSOL assumes by default this (x,y,z) dependence and you do no write it out fully. with an analytical function you must do it.
This means that the ana1(x,y,z) will take x,y,z values from the operation (integration scan over entity linked to the way the formula is used inside COMSOL. (not sure I made myself clear now, hope so ;)
PS that was fr V4, for v3.5 you need t use a function call instead of the "ana1()" term, but it's the same
--
Good luck
Ivar
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Posted:
1 decade ago
i am working in vs 3.4. is there any differences?i am working in 2D.
i have 2electrodes in air(gap distance 1mm), one is grounded and one has potential of 3600V. i need to show if at that potential, changing the pressure(lower) and the temperature(higher) it makes any differences at the way discharge happens.
thank you a lot
i have 2electrodes in air(gap distance 1mm), one is grounded and one has potential of 3600V. i need to show if at that potential, changing the pressure(lower) and the temperature(higher) it makes any differences at the way discharge happens.
thank you a lot
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Posted:
1 decade ago
HI
i believe not, but Parameters are Constants and the ana1() are "functions"
--
Good luck
Ivar
i believe not, but Parameters are Constants and the ana1() are "functions"
--
Good luck
Ivar