reactingFoam wedge handling wrong U

dhondupant · November 23, 2010, 11:18

Hello

I have to work with reactingFoam from OF 1.5 and found a strange result in my velocity field of an wedge case.

case:

BC:
wedge 1 degree
two velocity Inlets with T=300K
one pressure Outlet
one axis
one Wall with U=0 and zeroGradient for the Rest

Setting:
no chemical reactions included!
Lewis number = 1 so TemperatureField = const 300K!

Result
reactingFoam from OF 1.5 shows a velocity near the axis region (5+velocity inlet) which is unphysically

Link: http://yfrog.com/6442357714p

reactingFoam from OF 1.7 will work as it shoud be

Link: http://yfrog.com/3w73942141p

The velocity Field will be calculated wrong in reactingFoam from OF 1.5 while other solvers like simpleFoam from OF 1.5 or reactingFoam from OF 1.7 will calculate a correct Velocity Field in a Wedge case.

Why is that? Whats missing in reactingFoam from OF 1.5

dhondupant · December 9, 2010, 08:34

ok i got it now,

in the new version of open foam the read in document structure changed for the gravity vector which was set to zero in the new open foam version and set to -9.81m²/s along flow direction in older foam version which is also correct compared to similliar fluent simulations.

thanks for your answers anyway

November 23, 2010, 11:18	reactingFoam wedge handling wrong U	#1
dhondupant New Member Dhondu Pant Join Date: Nov 2009 Posts: 6 Rep Power: 17	Hello I have to work with reactingFoam from OF 1.5 and found a strange result in my velocity field of an wedge case. case: BC: wedge 1 degree two velocity Inlets with T=300K one pressure Outlet one axis one Wall with U=0 and zeroGradient for the Rest Setting: no chemical reactions included! Lewis number = 1 so TemperatureField = const 300K! Result reactingFoam from OF 1.5 shows a velocity near the axis region (5+velocity inlet) which is unphysically Link: http://yfrog.com/6442357714p reactingFoam from OF 1.7 will work as it shoud be Link: http://yfrog.com/3w73942141p The velocity Field will be calculated wrong in reactingFoam from OF 1.5 while other solvers like simpleFoam from OF 1.5 or reactingFoam from OF 1.7 will calculate a correct Velocity Field in a Wedge case. Why is that? Whats missing in reactingFoam from OF 1.5

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December 9, 2010, 08:34		#2
dhondupant New Member Dhondu Pant Join Date: Nov 2009 Posts: 6 Rep Power: 17	ok i got it now, in the new version of open foam the read in document structure changed for the gravity vector which was set to zero in the new open foam version and set to -9.81m²/s along flow direction in older foam version which is also correct compared to similliar fluent simulations. thanks for your answers anyway