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Random function independent of mesh

Posted Jun 13, 2016, 3:46 p.m. EDT Mesh, Parameters, Variables, & Functions Version 5.1 2 Replies

Youness Alvandi
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I'm running a time-dependent simulation using the general form PDE interface. I have to assign random numbers for my initial condition. Since the random number generator in COMSOL takes the spatial coordinates as input, the distribution of the initial condition is very mesh sensitive. Is there anyway that I can make the initial condition mesh independent? I was thinking about generating a uniform distribution of random numbers independent of mesh and then some how do the interpolation and find nodal values corresponding with that distribution. Is this possible? How?
2 Replies Last Post Jan 22, 2017, 12:05 p.m. EST
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Hello Youness Alvandi

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Shayan Sombolestani
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Posted: 8 years ago Jan 20, 2017, 12:07 a.m. EST
Hi Younes,

please let me know if you find a way.

thanks,

Shayan
Hi Younes, please let me know if you find a way. thanks, Shayan
Youness Alvandi
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Posted: 8 years ago Jan 22, 2017, 12:05 p.m. EST
Yes, I made a reference model with a fine mesh and random initial condition, ran it and exported the distribution of the parameter I am interested in at time zero. And then used an interpolation function to import this distribution as an initial condition for my other models with coarser mesh.

Yes, I made a reference model with a fine mesh and random initial condition, ran it and exported the distribution of the parameter I am interested in at time zero. And then used an interpolation function to import this distribution as an initial condition for my other models with coarser mesh.

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