What does "AdjustPhi" do?

EmadTandis · April 23, 2011, 07:24

Hello everybody
In some solver we have "AdjustPhi(Phi,U,p)" that Adjust flux to obey continuty. I want to know what does it mean ?
Thanks.

marupio · April 26, 2011, 12:33

Going by memory here, I believe adjustPhi looks at all the boundary patches of the mesh, adding the mass flux. Some boundaries are adjustable, such as a pressure boundary condition. If the mass balance doesn't equal zero, it will modify the flux at the adjustable boundary conditions, and fail if it can't achieve a mass balance of zero. I also recall something to do with some sort of setPressure boolean (I forget its exact name). If setPressure is true, it will do all this, if it is false, it doesn't bother attempting this.

EmadTandis · April 29, 2011, 06:00

Do you mean this function just act on "mass flux of boundary conditions that does not fix"? and does not act on quantities of internal field?

marupio · April 29, 2011, 09:24

Yes, it doesn't touch the internal field. Just boundary patches that can be adjusted, such as zero gradient.

April 23, 2011, 07:24	What does "AdjustPhi" do?	#1
EmadTandis Member Emad Tandis Join Date: Sep 2010 Posts: 77 Rep Power: 15	Hello everybody In some solver we have "AdjustPhi(Phi,U,p)" that Adjust flux to obey continuty. I want to know what does it mean ? Thanks.

April 26, 2011, 12:33		#2
marupio Senior Member David Gaden Join Date: Apr 2009 Location: Winnipeg, Canada Posts: 437 Rep Power: 21	Going by memory here, I believe adjustPhi looks at all the boundary patches of the mesh, adding the mass flux. Some boundaries are adjustable, such as a pressure boundary condition. If the mass balance doesn't equal zero, it will modify the flux at the adjustable boundary conditions, and fail if it can't achieve a mass balance of zero. I also recall something to do with some sort of setPressure boolean (I forget its exact name). If setPressure is true, it will do all this, if it is false, it doesn't bother attempting this.

April 29, 2011, 06:00		#3
EmadTandis Member Emad Tandis Join Date: Sep 2010 Posts: 77 Rep Power: 15	Do you mean this function just act on "mass flux of boundary conditions that does not fix"? and does not act on quantities of internal field?

April 29, 2011, 09:24		#4
marupio Senior Member David Gaden Join Date: Apr 2009 Location: Winnipeg, Canada Posts: 437 Rep Power: 21	Yes, it doesn't touch the internal field. Just boundary patches that can be adjusted, such as zero gradient.