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URGENT...natural convection

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Old   February 26, 2005, 12:49
Default URGENT...natural convection
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alanna
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HI!trying to carry out natural convection in a 2d rectangular cavity (100mm X 50mm. the solution will not converge. Using Boussinesq approximation. Rayleigh num is of the order of 10^7 so flow is laminar. Left wall appplied temperature of ninety degrees and right wall at 50....Have used suggested set up as in user tutorial and have altered under relaxation values but residuals wont converge!!Any tips PLease????
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Old   February 28, 2005, 21:59
Default Re: URGENT...natural convection
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abong
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try using ideal gas, lower under-relax factor.
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Old   March 1, 2005, 10:07
Default Re: URGENT...natural convection
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alanna
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Hi thanks for responding!im using water. Have tried lowering under-relaxation values but still wont converge. If you have any more advice please post it....need to finish this project soon
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Old   March 2, 2005, 12:46
Default Re: URGENT...natural convection
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Evan Rosenbaum
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Don't use Boussinesq. Define water as having density as a function of temperature (either a polynomial or piecewise linear).
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