# How to determine a steady flow?

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 December 28, 2001, 23:58 How to determine a steady flow? #1 Frankie Guest   Posts: n/a Sponsored Links 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?

 December 29, 2001, 09:17 Re: How to determine a steady flow? #2 Andy Guest   Posts: n/a 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

 December 29, 2001, 20:25 Re: How to determine a steady flow? #3 david Guest   Posts: n/a if you don't have time to see/make the animations, try to monitor the gradient of solution parameters at some critical points. DC

 January 2, 2002, 21:58 Re: How to determine a steady flow? #4 Frankie Guest   Posts: n/a What do you mena by the 'gradient' of solution parameter?

 January 5, 2002, 20:18 Re: How to determine a steady flow? #5 dave Guest   Posts: n/a for example gradient of velocity component at some critical points. dv/dx for example

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