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Old   September 18, 2001, 22:13
Default on cavity driven flow
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hi there,

i have coded a progrom to simulate the flow in a rectangular cavity. the problem is formulated in vorticity-stream function. i employed the method of false transient and solutions were obtained for various Re numbers. to my surprise, for Re>100(upwind scheme is used for Re>100), i obtained two different solutions for each Re by using different time step. i checked for the continuity equation and it is satisfied for both solutions.

can this be true or is it a kind of bifurcations? please advise. thanks in advance.

regards, yfyap
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Old   September 19, 2001, 06:24
Default Re: on cavity driven flow
Junseok Kim
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One of possibility is upwind method is explicit scheme, so it has CFL condition which is restricted by Re number.

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Old   September 19, 2001, 08:12
Default Re: on cavity driven flow
Sebastien Perron
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Sorry, there is only one solution for each Re nunber. Was your system truly converged in both cases?
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Old   September 19, 2001, 18:16
Default Re: on cavity driven flow
John C. Chien
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(1). Check out your code on a simpler check case first. (2). What is your "false transient" method?
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