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Dimension Mismatch - Spalart Allmaras

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Old   February 9, 2012, 19:43
Default Dimension Mismatch - Spalart Allmaras
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Kalyan
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Friends,

I am simulating the tip vortices from a wing and from already published material, it has been noted that the production term ( S_tilda) of SA turbulence model has to be tweaked a bit to get better results.

S_tilda is defined as =

I want to change the Omega term to

where , , and
I have 2 questions on this.

1. How do I write Sij ?
If I am not wrong it should be written as

sqrt(2)*mag(symm(fvc::grad(U_)))

2. When I do write it like that, put a min function to get the min between 0 and S - Omega, I get a dimension mismatch as below

Arguments of min have different dimensions
dimensions : [0 0 0 0 0 0 0] and [0 0 -1 0 0 0 0]

Can someone help me with this. Frankly, I don't see anything huge in this but I am a total noob when it comes to C++

Thanks,
Kalyan
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