How to form a constant profile in the empty domain

August 22, 2006, 17:36

Hello,

That is an old question, but nobody answered it(or I can't get the answer).

According to the reference on neutral atmospheric boundary layer, the inlet boundary is defined as velosity U(z)=u*ln(z/z0)/k, K=u*^2/SQRT(Cu),Epsilon(z)=u*^3/k*z, outlet is set as outflow.sides and top as symmetry. the data was got from the previous wind tunnel test.

Realisable k-eps,two layer wall funciton,smooth wall, structured mesh and second order were used in the empty domain. After convergence, there was a large difference between inlet profile and outlet profile. Then grid was refined, but the problem still existed.

What is the reason of it? How can I achieve the consant profile in the empty domain?

Thanks

Justin

August 23, 2006, 09:43

Do I need to use cyclic condition between inlet and oulet?

August 22, 2006, 17:36	How to form a constant profile in the empty domain	#1
justin Guest Posts: n/a	Hello, That is an old question, but nobody answered it(or I can't get the answer). According to the reference on neutral atmospheric boundary layer, the inlet boundary is defined as velosity U(z)=uln(z/z0)/k, K=u^2/SQRT(Cu),Epsilon(z)=u^3/kz, outlet is set as outflow.sides and top as symmetry. the data was got from the previous wind tunnel test. Realisable k-eps,two layer wall funciton,smooth wall, structured mesh and second order were used in the empty domain. After convergence, there was a large difference between inlet profile and outlet profile. Then grid was refined, but the problem still existed. What is the reason of it? How can I achieve the consant profile in the empty domain? Thanks Justin

August 23, 2006, 09:43	Re: How to form a constant profile in the empty do	#2
justin Guest Posts: n/a	Do I need to use cyclic condition between inlet and oulet?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
calculation of additional variable in multiple domain	cosine	CFX	12	April 24, 2016 13:51
Generating Velocity Profile inside domain.	Hisham	OpenFOAM	0	June 7, 2011 08:25
problem with importing and exporting profile BC	Gui	CFX	2	July 26, 2007 09:50
the difference profile in the empty domain	justin	Main CFD Forum	1	August 25, 2006 07:32
Prescribed inflow velocity profile - how to?	Alan	Main CFD Forum	10	October 28, 2005 13:14