Flow separation

rahulv · November 11, 2014, 23:37

The boundary layer separates from the wall when dp/dx < 0. To study this phenomenon, i study a diffuser case for laminar flow. I have plotted dp/dx contour and velocity vector for the diffuser. I realize boundary layer has separated even thought the dp/dx is positive on the wall. Am i understanding the separation phenomena correctly ? or i made some mistake in the analysis ?

lovecraft22 · November 15, 2014, 09:41

The flow separates if it undergoes an adverse pressure gradient, that is dp/dx > 0 and not < 0 (i.e. the pressure increases along the flow direction)

rahulv · November 15, 2014, 10:43

Thanks a lot

You are right.

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November 15, 2014, 09:41		#2
lovecraft22 Senior Member lore Join Date: Mar 2010 Location: Italy Posts: 460 Rep Power: 18	The flow separates if it undergoes an adverse pressure gradient, that is dp/dx > 0 and not < 0 (i.e. the pressure increases along the flow direction)

November 15, 2014, 10:43		#3
rahulv Member Rahul Vaibhav Join Date: Nov 2009 Location: India Posts: 33 Rep Power: 16	Thanks a lot You are right.