simulation of wall with holes

bitacovir · October 23, 2013, 21:48

I am trying to simulate wind blowing on a flat wall. 1.6m height and 4m length. (50mm thick).
Following several tutorials I could generate a mesh and insert a inflation layer on the surface of the wall. When I run a simulation the chart of convergence showed that RMS Residual Error Values have reduced to less than e-04 that I understand is good.
Then, I change the wall geometry with a wall with same size but including a vertical gaps producing a 20% of porosity in the wall.

I use the same parameters to produce the mesh and the inflation, but when I run the simulation the convergence remains between e-03 and e-04.
What do you think I can change or improve to results? Why is different when the surface of the geometry has holes?

ghorrocks · October 24, 2013, 05:28

FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

bitacovir · October 24, 2013, 06:54

Quote:

Originally Posted by ghorrocks

FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Thanks. I didn't know about this FAQ

October 23, 2013, 21:48	simulation of wall with holes	#1
bitacovir New Member Join Date: Aug 2012 Posts: 17 Rep Power: 13	I am trying to simulate wind blowing on a flat wall. 1.6m height and 4m length. (50mm thick). Following several tutorials I could generate a mesh and insert a inflation layer on the surface of the wall. When I run a simulation the chart of convergence showed that RMS Residual Error Values have reduced to less than e-04 that I understand is good. Then, I change the wall geometry with a wall with same size but including a vertical gaps producing a 20% of porosity in the wall. I use the same parameters to produce the mesh and the inflation, but when I run the simulation the convergence remains between e-03 and e-04. What do you think I can change or improve to results? Why is different when the surface of the geometry has holes?

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October 24, 2013, 05:28		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria