Boundary conditions

kabz · November 26, 2015, 10:45

Hi, i've got a basic question.

When specifying plug flow for 2D flow, does one maintain the no slip condition at the boundaries? What's the penalty for not doing so, if any?

FMDenaro · November 26, 2015, 11:02

Actually, considering the grid corner in a structured grid you can never exactly say if it is either a wall or a flow node...

kabz · November 26, 2015, 11:20

Thanks for the reply.

Does that apply only to grid corners? I'm asking with regards to the top and bottom boundaries of 2D flow

FMDenaro · November 26, 2015, 11:27

for example, in a 2d channel, the 2 inlet corners are singularity points but top and bottom boundaries must be prescribed as wall therefore no-slip condition for viscous flows

November 26, 2015, 10:45	Boundary conditions	#1
kabz New Member Join Date: Jul 2015 Posts: 18 Rep Power: 10	Hi, i've got a basic question. When specifying plug flow for 2D flow, does one maintain the no slip condition at the boundaries? What's the penalty for not doing so, if any?

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November 26, 2015, 11:02		#2
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,768 Rep Power: 71	Actually, considering the grid corner in a structured grid you can never exactly say if it is either a wall or a flow node...

November 26, 2015, 11:20		#3
kabz New Member Join Date: Jul 2015 Posts: 18 Rep Power: 10	Thanks for the reply. Does that apply only to grid corners? I'm asking with regards to the top and bottom boundaries of 2D flow

November 26, 2015, 11:27		#4
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,768 Rep Power: 71	for example, in a 2d channel, the 2 inlet corners are singularity points but top and bottom boundaries must be prescribed as wall therefore no-slip condition for viscous flows