DNS from k-e code

January 2, 2006, 13:13

Hi, How can I change k-e code to DNS?.is it easy!?. Thanks in advance

January 2, 2006, 23:49

I also want to get my hand on that, advise from anyone out there is appreciated, ty

January 3, 2006, 04:58

Hi,

It depends on your code ... Things are not just easy as turning off the turbulent viscosity. I mean, to compute real DNS, you may also increase the precision achieved, by changing the schemes (spatial and temporal) and the boundary conditions ... At the end, one can wonder whether it is not better to start your new code from scratch ?!

Good luck

Buch

January 3, 2006, 10:27

Theoretically: reduce the mesh size and the time step below the smallest expected scales of the flow.

In practice: check your schemes (space-differentiation at the order 4 or more, time-integration at the order 2 or more).

Consider acoustic resolution (if yes, your have to adapt both solvers and BC)

January 2, 2006, 13:13	DNS from k-e code	#1
Zake Guest Posts: n/a	Hi, How can I change k-e code to DNS?.is it easy!?. Thanks in advance

January 2, 2006, 23:49	Re: DNS from k-e code	#2
ty Guest Posts: n/a	I also want to get my hand on that, advise from anyone out there is appreciated, ty

January 3, 2006, 04:58	Re: DNS from k-e code	#3
buch Guest Posts: n/a	Hi, It depends on your code ... Things are not just easy as turning off the turbulent viscosity. I mean, to compute real DNS, you may also increase the precision achieved, by changing the schemes (spatial and temporal) and the boundary conditions ... At the end, one can wonder whether it is not better to start your new code from scratch ?! Good luck Buch

January 3, 2006, 10:27	Re: DNS from k-e code	#4
Guillaume Guest Posts: n/a	Theoretically: reduce the mesh size and the time step below the smallest expected scales of the flow. In practice: check your schemes (space-differentiation at the order 4 or more, time-integration at the order 2 or more). Consider acoustic resolution (if yes, your have to adapt both solvers and BC)

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