Solving PDE time dependent

DiracRules · September 30, 2011, 06:42

Hi there!

I'm looking for a way to solve parabolic time dependent PDE (sth like Ut=Uxx).
Actually, I'm trying to write down my own solver since I need to perform some peculiar calculation, so what I'm asking is:

what kind of loop/iterative method should I use?

Since I'm quite new to CDF, I don't know all the possibilities and the different type of loops.

Thanks in advance!

nimasam · September 30, 2011, 06:53

hi firend
openFOAM solves pde equation for learning look into basic solver!

for example a syntax like this in OpenFOAM can solve ur problem

Code:

solve (fvm::ddt(U) == fvm:: laplacian (U))

for more information about openFoam syntax look at programmer guide chapter 2

DiracRules · September 30, 2011, 12:38

Thank you!
I am ashamed of my question. Just did not think enough. It was obvious. I had already written that line of code, I just thought I needed something more "complicated" -.-''

And can you give me some info about solving eigenvalue problems (like Uxx=lambda *U?
I need the solver to find both lambda and U.
I thought something like making a loop on lambda and see which solutions are non-zero, but I don't think it would work and I guess there are less expensive ways.

Thx

September 30, 2011, 06:42	Solving PDE time dependent	#1
DiracRules New Member Join Date: Jul 2011 Posts: 8 Rep Power: 15	Hi there! I'm looking for a way to solve parabolic time dependent PDE (sth like Ut=Uxx). Actually, I'm trying to write down my own solver since I need to perform some peculiar calculation, so what I'm asking is: what kind of loop/iterative method should I use? Since I'm quite new to CDF, I don't know all the possibilities and the different type of loops. Thanks in advance!

September 30, 2011, 06:53		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	hi firend openFOAM solves pde equation for learning look into basic solver! for example a syntax like this in OpenFOAM can solve ur problem Code: solve (fvm::ddt(U) == fvm:: laplacian (U)) for more information about openFoam syntax look at programmer guide chapter 2

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September 30, 2011, 12:38		#3
DiracRules New Member Join Date: Jul 2011 Posts: 8 Rep Power: 15	Thank you! I am ashamed of my question. Just did not think enough. It was obvious. I had already written that line of code, I just thought I needed something more "complicated" -.-'' And can you give me some info about solving eigenvalue problems (like Uxx=lambda *U? I need the solver to find both lambda and U. I thought something like making a loop on lambda and see which solutions are non-zero, but I don't think it would work and I guess there are less expensive ways. Thx