Help Required With Simple Test Case

steph79 · July 30, 2010, 13:44

Hey everyone,

Firstly while I have several years of experience with Fluent I am completely new to OpenFOAM and have had a hard time getting my head around the framework of the program. If someone could help me set up the following case I would be most grateful!

I want to set up a 500m x 25m 2-D structured mesh with 1m^2 cells as a transient, incompressible case (icoFoam ?) with (in Fluent-speak) a velocity inlet, two periodic faces and a pressure outlet. The velocity inlet has been prescribed with a user-defined function in Fluent and I could use some help implementing this in OpenFOAM also.

Later I will introduce some objects in the flow field and go to 3-D etc. but if I could get some help to start up this simple case asap then that would be great.

Thanks!

santos · July 30, 2010, 13:55

Hi,

Your case seems simple to setup in OpenFOAM. The best option to prescribe your user-defined function in the inlet is to use the groovyBC utility that is available in the OpenFOAM wiki.

Regards,
Jose Santos

steph79 · July 30, 2010, 14:43

Thanks for that tip! Off-topic but I'm doing some cleaning right now as my room is a mess so I'll look into this groovyBC facility tomorrow!

I want to specify fluctuating u and v components though, rather than just an oscillating velocity magnitude normal to the inlet boundary.

I've found this test case...

http://openfoamwiki.net/index.php/Bl...Flow_Benchmark

...which is something like what I'll ultimately be doing. What I'll try and do is go as far as I can on my own modifying this code and when I come across problems I'll hopefully have more specific questions. Thanks again!

steph79 · July 31, 2010, 19:58

OK, I've managed to set up the case apart from my inlet BC...

steph79 · August 3, 2010, 08:45

http://www.cfd-online.com/Forums/ope...ent-inlet.html

July 30, 2010, 13:44	Help Required With Simple Test Case	#1
steph79 Member Join Date: Jul 2010 Posts: 37 Rep Power: 16	Hey everyone, Firstly while I have several years of experience with Fluent I am completely new to OpenFOAM and have had a hard time getting my head around the framework of the program. If someone could help me set up the following case I would be most grateful! I want to set up a 500m x 25m 2-D structured mesh with 1m^2 cells as a transient, incompressible case (icoFoam ?) with (in Fluent-speak) a velocity inlet, two periodic faces and a pressure outlet. The velocity inlet has been prescribed with a user-defined function in Fluent and I could use some help implementing this in OpenFOAM also. Later I will introduce some objects in the flow field and go to 3-D etc. but if I could get some help to start up this simple case asap then that would be great. Thanks!

July 31, 2010, 19:58		#4
steph79 Member Join Date: Jul 2010 Posts: 37 Rep Power: 16	OK, I've managed to set up the case apart from my inlet BC... Last edited by steph79; August 3, 2010 at 08:29.

August 3, 2010, 08:45	groovyBC	#5
steph79 Member Join Date: Jul 2010 Posts: 37 Rep Power: 16	http://www.cfd-online.com/Forums/ope...ent-inlet.html Last edited by steph79; August 4, 2010 at 13:19. Reason: Problem solved on other topic!

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July 30, 2010, 13:55		#2
santos Senior Member Jose Luis Santos Join Date: Mar 2009 Location: Portugal Posts: 215 Rep Power: 18	Hi, Your case seems simple to setup in OpenFOAM. The best option to prescribe your user-defined function in the inlet is to use the groovyBC utility that is available in the OpenFOAM wiki. Regards, Jose Santos

July 30, 2010, 14:43		#3
steph79 Member Join Date: Jul 2010 Posts: 37 Rep Power: 16	Thanks for that tip! Off-topic but I'm doing some cleaning right now as my room is a mess so I'll look into this groovyBC facility tomorrow! I want to specify fluctuating u and v components though, rather than just an oscillating velocity magnitude normal to the inlet boundary. I've found this test case... http://openfoamwiki.net/index.php/Bl...Flow_Benchmark ...which is something like what I'll ultimately be doing. What I'll try and do is go as far as I can on my own modifying this code and when I come across problems I'll hopefully have more specific questions. Thanks again!