Any method to strech the domain to infinity?

hadesmajesty · August 28, 2009, 11:25

I am simulating a flat plane boundary layer flow.
I want to set the outflow boundary at infinity. I have tried to use the grid transformation methods of Roberts (1971), but it seems that the streching leads to instabilty in my code.

So is there any good method to strech the domain to infinity?

Thank you in advance.

harishg · August 28, 2009, 22:41

If stretching causes instability in your code, there is a problem with numerical method (central difference for convection?, whats outflow BC?). So I would advice you to first analyze other possible options for your error.

hadesmajesty · August 28, 2009, 23:53

OK. I see what you mean. Thank you so much.

August 28, 2009, 11:25	Any method to strech the domain to infinity?	#1
hadesmajesty Member Edison Join Date: Mar 2009 Posts: 40 Rep Power: 17	I am simulating a flat plane boundary layer flow. I want to set the outflow boundary at infinity. I have tried to use the grid transformation methods of Roberts (1971), but it seems that the streching leads to instabilty in my code. So is there any good method to strech the domain to infinity? Thank you in advance.

August 28, 2009, 23:53		#3
hadesmajesty Member Edison Join Date: Mar 2009 Posts: 40 Rep Power: 17	OK. I see what you mean. Thank you so much. Last edited by hadesmajesty; August 29, 2009 at 03:04.

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August 28, 2009, 22:41		#2
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	If stretching causes instability in your code, there is a problem with numerical method (central difference for convection?, whats outflow BC?). So I would advice you to first analyze other possible options for your error.