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Old   October 9, 2008, 13:55
Default time dependent problem
  #1
Adrian
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hi all

Im still working with cars Im trying to do depedent time calculations and I dont know which values do I have to put in Time step size (s) Number of time step and max. Iterations per time step to begin this test thank so much if anybody can help me greetings to you all
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Old   October 9, 2008, 15:48
Default Re: time dependent problem
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Paul
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What kind of time calculations do you mean?
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Old   October 10, 2008, 06:32
Default Re: time dependent problem
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Prasad
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I understand that you are working on the aerodynamics of a moving car. Please correct me if I'm wrong. May I ask why you need to do transient analysis for this?
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Old   October 10, 2008, 09:50
Default Re: Hi paul , Prasad ... from Adrian
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Adrian
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Hi matey Thank for your concern on my works and I working with cars and The flow pattern aroumd the car is highly unsteady beside the flow behind the car is separated so to get a good drag and lift result I guess that I must do unsteady analisis and to star this analysis I need some values of Time step size(s) Number of time steps and Max. Iterations per time step

Greetings Mateys and take care
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Old   October 10, 2008, 14:01
Default Re: Hi paul , Prasad ... from Adrian
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Will
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To start off I would suggest using the time it takes the freestream flow to pass through one cell.
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Old   October 10, 2008, 16:05
Default Re: Hi paul , Prasad ... from Adrian
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Prasad
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For a car speed of 100 m/s (or avg speed of incoming air - something like avg wind tunnel air speed), I would start with a quarter of a milisecond. But again, it depends upon the solution stability.
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Old   October 14, 2008, 22:24
Default Thank you all paul , Prasad ... from Adrian
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Adrian
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Thank you guys I will try anything else to do this test? I mean another advice?Can you tell your experience in cars if you did some thank you Adrian
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