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How to express a local concentration?

Posted May 7, 2011, 6:24 p.m. EDT Porous Media Flow Version 4.2a 2 Replies

Jiewen Xiong
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Hi guys,

I am doing a simulation about battery. Now I want to get a concentration of certain point(Let's say concentration at x=0 um 1D model) as a variable for a defined function. I am new to comsol, anyone can help me?

Thanks,

2 Replies Last Post Jun 25, 2012, 12:31 p.m. EDT
Bladimir Ramos
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Posted: 1 decade ago May 17, 2011, 11:19 p.m. EDT
Hi there,

you can define a local variable at that boundary you mentioned. When you define a variable, COMSOL allows you to define wether the variable is calculated over the whole domain or at a boundary.

Good luck on your simulations
Hi there, you can define a local variable at that boundary you mentioned. When you define a variable, COMSOL allows you to define wether the variable is calculated over the whole domain or at a boundary. Good luck on your simulations
Simin Akbariyeh
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Posted: 1 decade ago Jun 25, 2012, 12:31 p.m. EDT
I have a similar question regarding concentration at a certain depth. I have 3D model, which shows a cubic soil box. Now I need to use the concentration at z=0(ground surface) for the simulation time. In other words I want to use concentration at (z=0 and t). Based on the answer herein, I tried to define a local variable, but in this way I need to write an expression for this variable. This value should be from Comsol itself which can show c(0,t). How can apply this expression? I will really appreciate your help.
I have a similar question regarding concentration at a certain depth. I have 3D model, which shows a cubic soil box. Now I need to use the concentration at z=0(ground surface) for the simulation time. In other words I want to use concentration at (z=0 and t). Based on the answer herein, I tried to define a local variable, but in this way I need to write an expression for this variable. This value should be from Comsol itself which can show c(0,t). How can apply this expression? I will really appreciate your help.

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