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Can Fluent start a simulation from a negative time |
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November 23, 2008, 15:06 |
Can Fluent start a simulation from a negative time
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#1 |
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Hi all,
I am trying to do a simple 2D wave tank simulation. A solitary wave will be generated and propagate from left to right. I am using the DEFINE_CG_MOTION udf on the left wall (as a wavemaker). The velocity profile in the udf is a hyperbolic secant function varying with time. In order to have the left wall to follow the profile, the simulation needs to start from a negative time. I was just wondering if Fluent can start a simulation from a negative time? Thanks.. |
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November 23, 2008, 16:12 |
Re: Can Fluent start a simulation from a negative
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#2 |
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November 23, 2008, 16:43 |
Re: Can Fluent start a simulation from a negative
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#3 |
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Thank you Rogerio. I already have this tutorial. It uses sine function which starts at time 0 to generate waves. Do you know how to use sech function which starts at a negative time in Fulent?? Or, is there another way to get around??
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November 23, 2008, 17:18 |
Re: Can Fluent start a simulation from a negative
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#4 |
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I will talk with others researchers about it, īcause iīm new in Fluent.
Best regards, Rogerio. |
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November 23, 2008, 19:58 |
Re: Can Fluent start a simulation from a negative
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#5 |
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Thanks Rogerio.. At the mean time, can anyone else help??
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November 24, 2008, 16:49 |
Re: Can Fluent start a simulation from a negative
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#6 |
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You can set Fluent's flow time using the text command: (rpsetvar 'flow-time 0.0)
Replace 0.0 with the the flow-time you require. I have never tried using this with a negative time so I don't know if it will do what you require. |
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November 25, 2008, 16:48 |
Re: Can Fluent start a simulation from a negative
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#7 |
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Thanks.. I am trying it now, but I got this message saying INVALID COMMAND [rpsetvar]. Don't know why....
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November 25, 2008, 22:30 |
Re: Can Fluent start a simulation from a negative
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#8 |
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did you include the brackets when inputting the command?
copy the command below exactly (rpsetvar 'flow-time 0.0) |
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November 26, 2008, 07:00 |
Re: Can Fluent start a simulation from a negative
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#9 |
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No, I did not include the brackets. I copied the command line into the console window, then got that message.
I just tried it again, but no luck still getting the invalid command rpsetvar. I am using Fluent 6.3.26 on Windows. Thanks... |
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November 26, 2008, 16:00 |
Re: Can Fluent start a simulation from a negative
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#10 |
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you need to include the brackets....it won't work without them. Its a scheme command
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November 26, 2008, 21:06 |
Re: Can Fluent start a simulation from a negative
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#11 |
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Thanks a lot CDE!!! It worked. Yes, now I can start the simulation from a negative time.
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