1D gas feeding/dissipating process

entropies · November 20, 2011, 22:55

Hello,

I have a 1d problem of simulating gas feeding and dissipating process. The initial state of the tube is nearly vacuum. And the gas coming in has an atomsphere condition.

I've built my code in non-dimensional form and the feeding process works OK. But the problem comes out in the dissipation process which I don't know how to apply a mass out b.c.

The case I did is at time (t=1), a gradually decreasing density and pressure is applied at the last cell of the pipe. But it turns out only the state at the last cell changed. The rest of the domain is still under gas feeding condition.

Thanks.

entropies · November 20, 2011, 22:56

I really want to upload a movie about this. But the size of the vedio is about 997K. Is there anyone knows how to upload it another way?

Thanks!

entropies · November 20, 2011, 23:26

Here is the link to it. The flux is calculated by HLLC method.

http://youtu.be/_EVtg9JbBBA

Welcome to give critics.

November 20, 2011, 22:55	1D gas feeding/dissipating process	#1
entropies New Member Qi Guan Join Date: Aug 2011 Posts: 27 Rep Power: 14	Hello, I have a 1d problem of simulating gas feeding and dissipating process. The initial state of the tube is nearly vacuum. And the gas coming in has an atomsphere condition. I've built my code in non-dimensional form and the feeding process works OK. But the problem comes out in the dissipation process which I don't know how to apply a mass out b.c. The case I did is at time (t=1), a gradually decreasing density and pressure is applied at the last cell of the pipe. But it turns out only the state at the last cell changed. The rest of the domain is still under gas feeding condition. Thanks.

November 20, 2011, 23:26	Finally find a way to watch movie	#3
entropies New Member Qi Guan Join Date: Aug 2011 Posts: 27 Rep Power: 14	Here is the link to it. The flux is calculated by HLLC method. http://youtu.be/_EVtg9JbBBA Welcome to give critics.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mass flow in is not equal to mass flow out	saii	CFX	12	March 19, 2018 05:21
Constant velocity of the material	Sas	CFX	15	July 13, 2010 08:56
Modelling of process of a filtration of carbonic gas	DoctorPDV	CFX	2	July 28, 2009 06:07
Two-Phase Buoyant Flow Issue	Miguel Baritto	CFX	4	August 31, 2006 12:02
Gas pressure question	Dan Moskal	Main CFD Forum	0	October 24, 2002 22:02

November 20, 2011, 22:56		#2
entropies New Member Qi Guan Join Date: Aug 2011 Posts: 27 Rep Power: 14	I really want to upload a movie about this. But the size of the vedio is about 997K. Is there anyone knows how to upload it another way? Thanks!