Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
How to assign a 2D random function as porous matrix property (porosity)
Posted 2011年7月1日 GMT-4 02:53 Fluid & Heat Version 4.0a, Version 4.3a 4 Replies
Please login with a confirmed email address before reporting spam
I really need your help, because I can't find anything in the help files.
I have a model using the the Brinkman Equations module for 2 dimensional porous media flow.
I want the porosity of the matrix to variate around the mean value of 0.5, so I defined a 2 dimensional random function named rn1 to describe this.
Now my problem is, that I can't define the porosity in the porous matrix properties as this rn function. I suspect, there is some kind of special "term" I have to use.
It would be great if you could help me!
Thank's a lot!
Jaques
Please login with a confirmed email address before reporting spam
Please login with a confirmed email address before reporting spam
I have the same exact problem. I'm trying to simulate a random distribution of Quantum Dots in a dielectric material.
It looks like the graphics objects don't want to work with externally defined functions.
Did you ever solve it?
Please login with a confirmed email address before reporting spam
Did you solve the problem?
I met the same problem with now.
Thanks
Please login with a confirmed email address before reporting spam
It works, if you call it using "component syntax" in the text field for a user-defined porosity, such as
comp1.rn1(x[1/m],y[1/m])
if you have added a Random function called rn1 in Component 1 (comp1). The [1/m] syntax is used to make the input arguments dimensionless and hence avoid a warning about an unexpected unit of input.
Best regards,
Magnus Ringh, COMSOL