Please Help- Modeling unsteady velocity

November 11, 2005, 17:11

Hi all, I want to simulate an unsteady (pulsatile) velocity in Fluent. I have approximated the waveform as sine function of the same frequency, so that it's easier to work with. The equation that I have is

Q = A + B* sin(2*pi*f*t)

I have the values of the constants and the frequency, f. How do I send this to Fluent? Do I have to write a code in C to generate this waveform? Or just define the waveform? And how do I do this? I read the Help menu, but could not figure out how to do it. Can someone help me out? Any help will be ppreciated.

Thanks a lot.

Vidya

November 11, 2005, 19:22

There is an example in the Fluent Manual using a similar case as your. Yes-- you need to type a short UDF using C to achieve this.

Anindya

November 11, 2005, 17:11	Please Help- Modeling unsteady velocity	#1
Vidya Raja Guest Posts: n/a	Hi all, I want to simulate an unsteady (pulsatile) velocity in Fluent. I have approximated the waveform as sine function of the same frequency, so that it's easier to work with. The equation that I have is Q = A + B* sin(2pif*t) I have the values of the constants and the frequency, f. How do I send this to Fluent? Do I have to write a code in C to generate this waveform? Or just define the waveform? And how do I do this? I read the Help menu, but could not figure out how to do it. Can someone help me out? Any help will be ppreciated. Thanks a lot. Vidya

November 11, 2005, 19:22	Re: Please Help- Modeling unsteady velocity	#2
Anindya Guest Posts: n/a	There is an example in the Fluent Manual using a similar case as your. Yes-- you need to type a short UDF using C to achieve this. Anindya

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Unsteady Flow Modeling in Flow3D	flow3d_399	FLOW-3D	6	August 13, 2009 23:34
Unsteady velocity magnitude- DNS	Rohan	FLUENT	0	May 19, 2008 17:07
Unsteady Physiological Velocity Inlet	Taewon	FLUENT	0	March 9, 2008 19:32
Velocity Under-relaxation in SIMPLE type methods	Matt U.	Main CFD Forum	6	July 4, 2005 06:29
Unsteady Velocity - UDF in parallel	Prateep Chatterjee	FLUENT	4	November 23, 2001 05:40