How to define two seperate boundary conditions?

NightWing · February 28, 2016, 03:52

Hi all,

I want to know, how can i give two seperate boundary conditions on a part. for eg: suppose i have a long cylindrical tube. i want to give two set of boundary condition on this tube.

1. the upper end (if i cut it along diameter) of the tube has a flux condition which is some value.

2. the lower end of the same tube has a flux condition of some other value.

may i know, how to do this?

LuckyTran · February 28, 2016, 20:54

You need to split that boundary into two separate distinct boundaries. Then you can apply your individual boundary conditions to each.

You can try to split it in Fluent (which might not work), or go back to the geometry/mesh and split it there. It's better to split it during the geometry/mesh generation process because you need the cells to be generated properly on those faces.

February 28, 2016, 03:52	How to define two seperate boundary conditions?	#1
NightWing Member Akr Join Date: Apr 2015 Location: India Posts: 53 Rep Power: 11	Hi all, I want to know, how can i give two seperate boundary conditions on a part. for eg: suppose i have a long cylindrical tube. i want to give two set of boundary condition on this tube. 1. the upper end (if i cut it along diameter) of the tube has a flux condition which is some value. 2. the lower end of the same tube has a flux condition of some other value. may i know, how to do this?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
sliding mesh problem in CFX	Saima	CFX	46	September 11, 2021 07:38
How and what to define on boundary conditions for embedded heating block	HamidN7	FLUENT	0	October 16, 2015 14:00
Overflow Error in Multiphase Modelling with Two Continuous Fluids	ashtonJ	CFX	6	August 11, 2014 14:32
GETVAR Error in Multiband Monte Carlo Radiation Simulation with Directional Source	silvan	CFX	3	June 16, 2014 09:49
Free surface boudary conditions with SOLA-VOF	Fan	Main CFD Forum	10	September 9, 2006 12:24

February 28, 2016, 20:54		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	You need to split that boundary into two separate distinct boundaries. Then you can apply your individual boundary conditions to each. You can try to split it in Fluent (which might not work), or go back to the geometry/mesh and split it there. It's better to split it during the geometry/mesh generation process because you need the cells to be generated properly on those faces.