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[Sponsors] |
December 28, 2001, 22:58 |
How to determine a steady flow?
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#1 |
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Currently, I am simulating the unsteady air flow in a gas turbine enclosure. How could I know whether the flow has become steady or not?
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December 29, 2001, 08:17 |
Re: How to determine a steady flow?
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#2 |
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You can set up a macro to record the turbulent viscosity, say every 50 iterations, and leave the simulation running for say 500-1000 iterations. If you have an animation package, paint-shop pro, then you will be able to animate the above 10 or more slides to see any wake or 'unsteadiness' in the flow field. It is a brilliant way to visualise the flow field in a global manor. Of course it does not provide any mathematical verification of a steady flow, it is purely visual, however, will there really be any purely steady flow?
Andy |
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December 29, 2001, 19:25 |
Re: How to determine a steady flow?
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#3 |
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if you don't have time to see/make the animations, try to monitor the gradient of solution parameters at some critical points.
DC |
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January 2, 2002, 20:58 |
Re: How to determine a steady flow?
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#4 |
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What do you mena by the 'gradient' of solution parameter?
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January 5, 2002, 19:18 |
Re: How to determine a steady flow?
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#5 |
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for example gradient of velocity component at some critical points. dv/dx for example
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