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A question about the PDE mode

Posted 24 giu 2011, 17:51 GMT-4 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 27 giu 2011, 09:44 GMT-4
Lars Gregersen COMSOL Employee

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Posted: 1 decade ago 25 giu 2011, 08:56 GMT-4
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 27 giu 2011, 02:11 GMT-4
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 27 giu 2011, 09:44 GMT-4

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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