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Search: Posts Made By: maximsch2
Forum: Main CFD Forum October 11, 2011, 16:11
Replies: 12
Views: 2,821
Posted By maximsch2
fuser, Thank you! Actually I've already found the...

fuser, Thank you! Actually I've already found the problem - turned out it was in my code (wrong handling of one of the sides of triangles).
Forum: Main CFD Forum February 7, 2011, 11:50
Replies: 12
Views: 2,821
Posted By maximsch2
That code was supposed to be for Godunov's exact...

That code was supposed to be for Godunov's exact Rieman solver:
Godunov(left_u, right_u):
if left_u < right_u: return min(f(u))
else: return max(f(u))
In case of scalar linear advection it...
Forum: Main CFD Forum February 5, 2011, 13:20
Replies: 12
Views: 2,821
Posted By maximsch2
Ok, I've investigated this problem a bit more and...

Ok, I've investigated this problem a bit more and now I am completely confused.
I've read that Godunov flux is the least diffusive flux.
My code for Godunov flux:

def godunov_flux(left_val,...
Forum: Main CFD Forum February 5, 2011, 12:33
Replies: 12
Views: 2,821
Posted By maximsch2
I've looked at Roe's flux, but it seems to me...

I've looked at Roe's flux, but it seems to me that in scalar linear case it is equal to upwind flux, isn't it?
Forum: Main CFD Forum February 5, 2011, 12:22
Replies: 12
Views: 2,821
Posted By maximsch2
I guess DG code is OK, because I get some results...

I guess DG code is OK, because I get some results for cavity flow. The problem is that in those results flow looks like Reynolds number is lower than I set.
Forum: Main CFD Forum February 5, 2011, 11:25
Replies: 12
Views: 2,821
Posted By maximsch2
My equation is: \frac{\partial{u}}{\partial{t}} +...

My equation is: \frac{\partial{u}}{\partial{t}} + v*\nabla{u} = \Omega Where u is 2d vector, v is constant 2d vector. \Omega depends on u. Now I am using simple upwind flux: if n*u >= 0 I use value...
Forum: Main CFD Forum February 5, 2011, 06:20
Replies: 12
Views: 2,821
Posted By maximsch2
Question DG on triangular mesh - numerical viscosity

I am implementing discontinuous galerkin code (based on book by Hesthaven& Warburton) for lattice boltzman method (essentially system of linear advection equations). I am using upwind (=...
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