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A question about the PDE mode

Posted Jun 24, 2011, 5:51 p.m. EDT Version 4.1 3 Replies

Xiaoyi Yu
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I want to solve two coupled PDEs, both of them can be written in General Form. What's the difference between these two methods below?
1. create one General Form PDE interface with two dependent variables
2. create two General Form PDE interfaces, and each interface contains one dependent varibale

3 Replies Last Post Jun 27, 2011, 9:44 a.m. EDT
Lars Gregersen COMSOL Employee

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Posted: 1 decade ago Jun 25, 2011, 8:56 a.m. EDT
Hi

There is no difference between the two methods from an equation point of view.

Method number 1 will most likely be the easiest to work with, especially for equations that are very dependent on each other. However, methods number 2 lets you choose different shape functions for the two dependent variables and you will also be able to choose to solve only one equartion at a time.


Lars Gregersen
Comsol Denmark
Hi There is no difference between the two methods from an equation point of view. Method number 1 will most likely be the easiest to work with, especially for equations that are very dependent on each other. However, methods number 2 lets you choose different shape functions for the two dependent variables and you will also be able to choose to solve only one equartion at a time. Lars Gregersen Comsol Denmark
Mainak Biswas
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Posted: 1 decade ago Jun 27, 2011, 2:11 a.m. EDT
sir, can u tell me how to input a coupled PDE in comsol 4.0
sir, can u tell me how to input a coupled PDE in comsol 4.0
Xiaoyi Yu
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Posted: 1 decade ago Jun 27, 2011, 9:44 a.m. EDT

sir, can u tell me how to input a coupled PDE in comsol 4.0


What's your PDE like? If you are a new user, you'd better find an example in the model library to become familiar with the operation.
[QUOTE] sir, can u tell me how to input a coupled PDE in comsol 4.0 [/QUOTE] What's your PDE like? If you are a new user, you'd better find an example in the model library to become familiar with the operation.

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