boundary conditions for explosion in a tube

shangzung · October 28, 2009, 13:36

Hello!

I am simulating an explosion inside a tube. I can not figure out how to set the wall boundary conditions for the pressure p in the folder 0/p so that the wall pressure is calculated. Now I only can start simulation, when I set the wall boundaries for the walls to "fixedValue" and set that value to 1 bar. When I set them to "calculated", the simulation crashes in the first timestep. What am I doing wrong there?

bhh · October 29, 2009, 14:06

The boundary condition for pressure for walls should be zeroGradient.
rgds
Bjorn

October 28, 2009, 13:36	boundary conditions for explosion in a tube	#1
shangzung Member Dennis Rown Join Date: Oct 2009 Posts: 51 Rep Power: 17	Hello! I am simulating an explosion inside a tube. I can not figure out how to set the wall boundary conditions for the pressure p in the folder 0/p so that the wall pressure is calculated. Now I only can start simulation, when I set the wall boundaries for the walls to "fixedValue" and set that value to 1 bar. When I set them to "calculated", the simulation crashes in the first timestep. What am I doing wrong there?

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October 29, 2009, 14:06		#2
bhh Member Bjorn H. Hjertager Join Date: Mar 2009 Posts: 72 Rep Power: 17	The boundary condition for pressure for walls should be zeroGradient. rgds Bjorn