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Old   September 6, 2005, 06:41
Default POWER LAW DISCRETISATION SCHEME
  #1
Dammy
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Is power Law a first order scheme?

I found out that my predictions are better when using power Law compared second order upwind.

Can anyone advise why this is happening?

I found out that my convergence is faster with this.
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Old   September 6, 2005, 06:56
Default Re: POWER LAW DISCRETISATION SCHEME
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Luca
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What kind of problem are you solving? It depends on the ratio beetween adventive and diffusive terms. Luca
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Old   September 6, 2005, 07:55
Default Re: POWER LAW DISCRETISATION SCHEME
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Dammy
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I am trying to predict the hydrodynamics of flow in stirred tank reactor of 300rpm. The mean velocities(axial, radial & tangential) & turbulent quantities are of interest to me.

Expecting yr reply
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Old   September 6, 2005, 08:05
Default Re: POWER LAW DISCRETISATION SCHEME
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Luca
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When you say "better" what does it mean? only faster convergence or a better fidelity to experimental case?Luca
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Old   September 6, 2005, 14:17
Default Re: POWER LAW DISCRETISATION SCHEME
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Dammy
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Compare to experimental data, that is what i mean
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Old   September 7, 2005, 09:36
Default Re: POWER LAW DISCRETISATION SCHEME
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Arthur
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Old   September 7, 2005, 09:45
Default Re: POWER LAW DISCRETISATION SCHEME
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Vinod Dhiman
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Hi

In case of your problem, even the second order upwind will give worse results than given by Power Law. Although Power Law is not a good enough scheme, but in your problem flow dependency is much higher, which is neglected by Upwind.

Vinod Dhiman
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