Train in a tunnel with CFX

UDEV_STARTER · February 20, 2012, 15:31

Hi all,

could someone tell me if it is possible to simulate the flow around a train in a tunnel. In Star/Fluent I would use the "death and birth" feature. Unfortunatly I couldn't find something like this in the cfx tutorials.The ballvalve tut and similar are not approriate. I need a feature where i can switch from solid to fluid from one timestep to another in combination with moving mesh and the possibility of adding and removing cells in front/after the train. Otherwise the moving part of the mesh would move outside the tunnel.

Thx in Ad.

ghorrocks · February 20, 2012, 16:56

Yes, it is possible. CFX does not support cell death and birth. You could do this using immersed solids (which is very similar in effect to death and birth), or using a GGI interface to "slide" the train into the tunnel.

February 20, 2012, 15:31	Train in a tunnel with CFX	#1
UDEV_STARTER New Member Join Date: Feb 2012 Posts: 1 Rep Power: 0	Hi all, could someone tell me if it is possible to simulate the flow around a train in a tunnel. In Star/Fluent I would use the "death and birth" feature. Unfortunatly I couldn't find something like this in the cfx tutorials.The ballvalve tut and similar are not approriate. I need a feature where i can switch from solid to fluid from one timestep to another in combination with moving mesh and the possibility of adding and removing cells in front/after the train. Otherwise the moving part of the mesh would move outside the tunnel. Thx in Ad.

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February 20, 2012, 16:56		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,933 Rep Power: 145	Yes, it is possible. CFX does not support cell death and birth. You could do this using immersed solids (which is very similar in effect to death and birth), or using a GGI interface to "slide" the train into the tunnel.