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 June 22, 2005, 04:53 UDF_unsteady #1 Akbar Guest   Posts: n/a Dear Sir I am doing unsteady analysis of nozzle, pressure at inlet is varying from 10 bar to 1 bar from 0 to 2 sec. I wrote udf's for total pressure and supersonic/ initial gauge pressure at inlet. But fluent define only one udf at a time. when i define second udf, firstly define udf was disappeare from the memory. How can I define time verying profile of total pressure and supersonic/ initial gauge pressure at inlet? -------------------------------------------------- For an unsteady problem, at a point in flow domain, I am looking to draw plot of a property (mach number , velocity etc.) vs time. Is it possible to draw plots of properties vs time? If possible, please guide me. Thanks & Regards

 June 22, 2005, 10:25 Re: UDF_unsteady #2 david Guest   Posts: n/a hi, Just create a point surface of the precise location you want to monitor by exploring surface/point. Once this surface is created, create a monitor of the quantity you wish to monitor under solve/monitors. Unless you to monitor some special quantity not available in Fluent, you do not need a UDF for this. Hope this helps David

 June 22, 2005, 13:29 Re: UDF_unsteady #3 dirk Guest   Posts: n/a You have to put all your UDFs into one file.

 June 23, 2005, 05:56 Re: UDF_unsteady #4 Akbar Guest   Posts: n/a thanks its working

 June 23, 2005, 06:03 Re: UDF_unsteady #5 Akbar Guest   Posts: n/a Its working, thanks. I am doing analysis of a nozzle , solution is going to converge at inlet pressure 45 bar & outlet pressure 1 bar, but it is going to divarge when i am imposing inlet pressure around 5 bar. for same geometry and same boundary condition why its happening? I think flow physics become so complex, so fluent diverge. May yoy help that how can I get a converge solution at low pressure inlet?

 June 23, 2005, 06:04 Re: UDF_unsteady #6 Akbar Guest   Posts: n/a Thanks its working. I am doing analysis of a nozzle , solution is going to converge at inlet pressure 45 bar & outlet pressure 1 bar, but it is going to divarge when i am imposing inlet pressure around 5 bar. for same geometry and same boundary condition why its happening? I think flow physics become so complex, so fluent diverge. May you help that how can I get a converge solution at low pressure inlet?

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