TVD grid resolution

September 23, 2008, 21:59

Hi

From what I have read it appears the simulations using TVD method have relatively coarsely meshes. From my personal experiences, the finer mesh the more problems i encounter with boundary conditions and 'streaklines'. Why is this so?

Shuo

September 24, 2008, 16:52

you use TVD methods in coarse meshes because you cant see much differences between discretization schemes in fine meshes. as you may know, even FOU works good enough in a fine grid. the main idea to develop TVD is to achieve high resolution in coarse grids.

September 24, 2008, 17:56

Sorry what does FOU stand for? ALso could you please provide me with some references on grid resolution and TVD methods.

Thanks Shuo

September 25, 2008, 15:40

FOU= First Order Upwind unfortunately I dont remember any reference on grid resolution. good luck

September 25, 2008, 18:12

My personal experience shows that fine grids introduce instabilities and reflections from the 'non-reflecting B.C.'

September 23, 2008, 21:59	TVD grid resolution	#1
Shuo Guest Posts: n/a	Hi From what I have read it appears the simulations using TVD method have relatively coarsely meshes. From my personal experiences, the finer mesh the more problems i encounter with boundary conditions and 'streaklines'. Why is this so? Shuo

September 24, 2008, 16:52	Re: TVD grid resolution	#2
meda Guest Posts: n/a	you use TVD methods in coarse meshes because you cant see much differences between discretization schemes in fine meshes. as you may know, even FOU works good enough in a fine grid. the main idea to develop TVD is to achieve high resolution in coarse grids.

September 24, 2008, 17:56	Re: TVD grid resolution	#3
shuo Guest Posts: n/a	Sorry what does FOU stand for? ALso could you please provide me with some references on grid resolution and TVD methods. Thanks Shuo

September 25, 2008, 15:40	Re: TVD grid resolution	#4
and Guest Posts: n/a	FOU= First Order Upwind unfortunately I dont remember any reference on grid resolution. good luck

September 25, 2008, 18:12	Re: TVD grid resolution	#5
shuo Guest Posts: n/a	My personal experience shows that fine grids introduce instabilities and reflections from the 'non-reflecting B.C.'

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