Free Convection Test Case

SharpS · April 3, 2020, 07:01

Hey,

I have a case with natural convection and for better undestanding I wanted to start with a simple Testcase.

My idea was to look at a cube where four sides are inlets, one is an outlet and one heated wall.
For my understanding the wall should heat up the air near to it and create an outflow and an inflow by this.
I managed to set it up but I have no idea how to select the right BCs for U, p and p_rgh.
The tutorial cases with free convection usually have walls everywhere around it. But my main aim is to create flows at the inlet/outlet boundaries by the natural convection.

Can anyone help me with setting up the BCs?

Best wishes

Nik

geth03 · June 3, 2020, 06:35

your case looks little bit complex,
why don't you first start with a simple tutorial case and adjust
it step by step?
you can check after one step if the solver is running.
as of BC for inlets, you can use fixedvalues velocities and for your outlet pressureInletOutlet velocity. for p_rgh set fixedValue for outlet and fixedFluxPressure for inlets. for p use calculated.

April 3, 2020, 07:01	Free Convection Test Case	#1
SharpS New Member Join Date: Feb 2020 Posts: 5 Rep Power: 6	Hey, I have a case with natural convection and for better undestanding I wanted to start with a simple Testcase. My idea was to look at a cube where four sides are inlets, one is an outlet and one heated wall. For my understanding the wall should heat up the air near to it and create an outflow and an inflow by this. I managed to set it up but I have no idea how to select the right BCs for U, p and p_rgh. The tutorial cases with free convection usually have walls everywhere around it. But my main aim is to create flows at the inlet/outlet boundaries by the natural convection. Can anyone help me with setting up the BCs? Best wishes Nik

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Test Case CFL Number Issues with Software Update	JBCFD	SU2	3	July 14, 2017 12:05
Is Playstation 3 cluster suitable for CFD work	hsieh	OpenFOAM	9	August 16, 2015 14:53
forced and free convection over a hot sphere	the new one	Main CFD Forum	0	October 16, 2013 04:32
Error when run test case turb_ONERAM	mistuning	SU2	1	October 3, 2013 01:17
Free surface boudary conditions with SOLA-VOF	Fan	Main CFD Forum	10	September 9, 2006 12:24

June 3, 2020, 06:35		#2
geth03 Senior Member Join Date: Dec 2019 Location: Cologne, Germany Posts: 355 Rep Power: 8	your case looks little bit complex, why don't you first start with a simple tutorial case and adjust it step by step? you can check after one step if the solver is running. as of BC for inlets, you can use fixedvalues velocities and for your outlet pressureInletOutlet velocity. for p_rgh set fixedValue for outlet and fixedFluxPressure for inlets. for p use calculated.