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April 24, 2002, 04:52 |
Navier-Stokes Equation - unit problems
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#1 |
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Hello.
I have a problem with interpreting results of numerical calculations. Let say, than i'm solving full 2D NS equation. Somebody asked me what is really size of the tank. And.. let: WIDTH and HEIGHT are the screen calculations NX and NY are grid size (number of cells) now i calculate DX and DY as WIDTH/NX and HEIGHT/NY VIS is viscosity of the fluid GY is grawity vector DT is float delta time now let: WIDTH=320 HEIGHT=200 NX=32 NY=20 then DX = DY = 10 let: VIS = 0.1 GY = -9.8 DT = 0.01 now im asking: from where i know what is size of my tank and other physically properties of my fluid model? is that determined by GY unit (m/s^2)??? i really dont know what are units of my calculations, and my results are only qualitate not quatitate. Maciej Matyka, author of Fluid NS solver - available at http://panoramix.ift.uni.wroc.pl/~maq |
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