Unsteady Problem Convergence

March 16, 2005, 05:43

Hello,

When I run the unsteady problem by including UDF at the vel inlet(to define the velocity profile, I do not get convergence. The residuals plots show that it fluctuates and no sign of going flat. I am modelling flow around cylinder in water. Can some one help me with this? Where did I do something wrong?

Sham.

March 16, 2005, 12:58

have u calculated the Re. it might be in unsteady, thats why u r getting fluctuations.if it is in unsteady regime it will never go flat and will reach periodic steady state.

March 17, 2005, 04:34

The Re is 1.4x10^5. If it is the case, how can I monitor for the convergence?

March 16, 2005, 05:43	Unsteady Problem Convergence	#1
Sham Guest Posts: n/a	Hello, When I run the unsteady problem by including UDF at the vel inlet(to define the velocity profile, I do not get convergence. The residuals plots show that it fluctuates and no sign of going flat. I am modelling flow around cylinder in water. Can some one help me with this? Where did I do something wrong? Sham.

March 16, 2005, 12:58	Re: Unsteady Problem Convergence	#2
Srinivas Guest Posts: n/a	have u calculated the Re. it might be in unsteady, thats why u r getting fluctuations.if it is in unsteady regime it will never go flat and will reach periodic steady state.

March 17, 2005, 04:34	Re: Unsteady Problem Convergence	#3
Sham Guest Posts: n/a	The Re is 1.4x10^5. If it is the case, how can I monitor for the convergence?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
problem saving drag convergence history	raheelrasool	FLUENT	3	April 20, 2009 09:04
Continuity eq convergence problem	carno	FLUENT	4	February 8, 2008 04:04
Unsteady Boundary Layer Problem	C.J.Yoon	Main CFD Forum	0	January 27, 2006 04:19
convergence problem	Trushar	Phoenics	5	August 27, 2002 23:40
Convergence problem when ustructured mesh is used.	SangJin Ryu	Siemens	3	October 5, 2000 20:26