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how to cite the value of a variable at specific location

Posted May 12, 2011, 12:51 p.m. EDT Computational Fluid Dynamics (CFD), Parameters, Variables, & Functions Version 4.3 4 Replies

Jifeng Hu
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Hi,

I have defined a 1D diffusion problem in [0,1]. Say, the dependent variable is u. If I want to put the value of u at x=0.5 into other function, how do I cite the value? is it u(x=0.5)? More generally, for any internal variable on the domain, can I use internal_variable(x=0.5)?

Thanks for your help in advance.

Jifeng
4 Replies Last Post Jul 11, 2012, 9:53 a.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago May 12, 2011, 1:28 p.m. EDT
You can use a Model Coupling of the Integration type at the point in question to do this.
You can use a Model Coupling of the Integration type at the point in question to do this.
Jifeng Hu
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Posted: 1 decade ago May 12, 2011, 1:38 p.m. EDT
Hi Jean-Francois,

Can you be a little more specific? do I need delta function?

Thanks,
Jifeng
Hi Jean-Francois, Can you be a little more specific? do I need delta function? Thanks, Jifeng
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago May 12, 2011, 1:55 p.m. EDT
Specifically, read the User's Guide manual, version 4.1, page 146 and following.
Specifically, read the User's Guide manual, version 4.1, page 146 and following.
Osameh Ghazian
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Posted: 1 decade ago Jul 11, 2012, 9:53 a.m. EDT
Hi,
I have the same problem,
I want to plot the velocity of the specific point versus time, it this correct to define a variable like this :
uu=u*(x==1&&y==1&&z==1)

I did not really get the Model Couplings for this problem,
what should i do ?
Hi, I have the same problem, I want to plot the velocity of the specific point versus time, it this correct to define a variable like this : uu=u*(x==1&&y==1&&z==1) I did not really get the Model Couplings for this problem, what should i do ?

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