Fully developed laminar channel flow

mechiebud · April 6, 2016, 14:24

I have written a code for laminar channel flow. Along the length of the channel the velocity should increase as we enter into fully developed region and then become constant.
But in my case it increases ,then decreases and becomes constant. Please can anyone guide me where I could be wrong.
Boundary conditions are no slip at wall
and d2u/dx2=d2v/dy2=0

FMDenaro · April 6, 2016, 16:51

plot your velocity profile from the inlet until to the outlet at some stations

mechiebud · April 7, 2016, 01:53

Quote:

Originally Posted by FMDenaro

plot your velocity profile from the inlet until to the outlet at some stations

I have done the same and I am getting the following velocity profile.
It decreases along the length.

FMDenaro · April 7, 2016, 03:18

Clearly, you do not fulfill the continuity constraint...

what method are you using?

mechiebud · April 7, 2016, 03:22

Quote:

Originally Posted by FMDenaro

Clearly, you do not fulfill the continuity constraint...

what method are you using?

I am using SMAC algorithm. The boundary conditions are as mentioned above.

FMDenaro · April 7, 2016, 03:51

check if the continuity equation is satisfied

mechiebud · April 7, 2016, 04:05

Quote:

Originally Posted by FMDenaro

check if the continuity equation is satisfied

No it's not. the divergence is high. Could you please guide me how to fix that. I am new to CFD and this is my first project.

April 6, 2016, 14:24	Fully developed laminar channel flow	#1
mechiebud Member mechiebud Join Date: Jan 2015 Posts: 49 Rep Power: 11	I have written a code for laminar channel flow. Along the length of the channel the velocity should increase as we enter into fully developed region and then become constant. But in my case it increases ,then decreases and becomes constant. Please can anyone guide me where I could be wrong. Boundary conditions are no slip at wall and d2u/dx2=d2v/dy2=0

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April 6, 2016, 16:51		#2
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,849 Rep Power: 73	plot your velocity profile from the inlet until to the outlet at some stations

April 7, 2016, 03:18		#4
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,849 Rep Power: 73	Clearly, you do not fulfill the continuity constraint... what method are you using?

April 7, 2016, 03:51		#6
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,849 Rep Power: 73	check if the continuity equation is satisfied