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Old   October 23, 2007, 13:50
Default Improve the computational cose?
  #1
jinwon park
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I am solving compressible inviscid two-fluid flows. To set initial conditions, I nondimensionalized the variables. When I used nondimensionalized initial conditions, I got results in shorter time than I used usual initial conditions. I wonder that the nondimensionalization help reducing computational time as well.

Why do you use the nondimensionalized initial conditions?
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Old   October 24, 2007, 08:52
Default Re: Improve the computational cose?
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Hatef
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I have very little experience in compressible cases and I just think that the nondimensionaliyation in compressible flows, like what we do in preconditioning procedure, mostly relates to convergence problem in low M number. this is just a guess and I am not quite sure whether this is the answer of your question or not.
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Old   October 24, 2007, 09:18
Default Re: Improve the computational cose?
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George
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It also has something to do with the digits that are kept for every variable. It is almost the same difference as using single-precision or double-precision. With the latter convergence comes quicker (in less iterations). For example, if a temperature is 1000. degrees in single precision only 4 digits after the "." are kept.
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Old   October 24, 2007, 09:25
Default Re: Improve the computational cose?
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Hatef
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If you are interested in observing the relation of preconditioning and rate of converged solution in low mach number compressible flow I refer you to paper by Asouti et al under the title of ' low Mach number preconditioning for 2d and 3d upwind flow solution schemes on unstructured grids' Just google it. you'll find freely!
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