# What is Gauss linear upwind?

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 June 19, 2012, 04:36 What is Gauss linear upwind? #1 New Member   Join Date: Oct 2011 Posts: 19 Rep Power: 5 Hi, i have a question concerning an existing case i didn't create by myself, but I have to use it. There's a divScheme i don't understand: div((nuEff*def(grad(U).T()))) Gauss linear upwind; I know linear is second order interpolation. I know upwind is first order interpolation. But I don't know how this one behaves and which on the argument of the other one is. Could someone tell me something like Gauus <...>? Gauss <...> ? Thanks for your help, okroud

 June 20, 2012, 18:38 #2 Senior Member     Kyle Mooney Join Date: Jul 2009 Location: Amherst, MA USA - San Diego, CA USA Posts: 285 Rep Power: 9 You could check out the source code for it here: Code: `/src/finiteVolume/lnInclude/linearUpwind.C` I'm not too familiar with its functionality. The code describes it as upwind with an explicit linear correction.

 June 20, 2012, 18:52 #3 New Member   Join Date: Oct 2011 Posts: 19 Rep Power: 5 Thanks. So you think that linear upwind is the same as linearUpwind and therefore a second Order Scheme?

 June 20, 2012, 18:55 #4 Senior Member     Kyle Mooney Join Date: Jul 2009 Location: Amherst, MA USA - San Diego, CA USA Posts: 285 Rep Power: 9 I'm not completely sure. I've actually never seen anything with that particular syntax. I've seen Code: `Gauss linear` and Code: `Gauss linearUpwind phi` but never the way you've written it.

July 2, 2012, 10:04
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Quote:
 Originally Posted by kmooney You could check out the source code for it here: Code: `/src/finiteVolume/lnInclude/linearUpwind.C` I'm not too familiar with its functionality. The code describes it as upwind with an explicit linear correction.
I looked at the file linearUpwind.C, but i have some Problems interpreting it. I see that it's upwind, but where do you see it has an explicit linear correction?

I'd realy like to understand the mathematical background of some of the schemes by watching the sourcecode, is there any source or work where the schemes are mathematically further explained?

 Tags divscheme, first order, linear upwind, second order

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