# howto write step velocity profile with expressions

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 May 18, 2006, 14:25 howto write step velocity profile with expressions #1 prabhu Guest   Posts: n/a i have to give inlet velocity as step function. Please anyone tell me what expression i should use. The velocity is a function of y. For 0

 May 18, 2006, 18:43 Re: howto write step velocity profile with express #2 Glenn Horrocks Guest   Posts: n/a Hi, Try: variable=step((y-10[m])/1[m])*50[m/s] This steps the velocity from 0 m/s to 50 m/s at y=10 metres. You need the divide by 1m to convert the distance to a dimensionless number. Regards, Glenn Horrocks

 May 23, 2006, 09:41 Re: howto write step velocity profile with express #3 Robin Guest   Posts: n/a Hi Prabhu, An alternative, and very easy way to do this is by creating a 1D profile. To make the change occur over a short distance, use the following points: 9.999 0 10.0 50 Use the "extend min" and "extend max" to make the values extend above and below your points. Regards, Robin

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