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lnk August 27, 2012 09:09

Question about DNS
 
Hi

Since DNS also cut off some modes, I'm wondering if DNS doesn't have any numerical error? Does it really bring perfect accurate simulation result? Is DNS also a turbulence modeling?

Best,
lnk

FMDenaro August 27, 2012 10:11

Quote:

Originally Posted by lnk (Post 378894)
Hi

Since DNS also cut off some modes, I'm wondering if DNS doesn't have any numerical error? Does it really bring perfect accurate simulation result? Is DNS also a turbulence modeling?

Best,
lnk

in DNS the Nyquist frequency pi/h, which formally cut the higher modes, is located in such a way that the Kolmogorov characteristic wavenumber pi/eta is smaller. In other words, the numerical errors in DNS, even if formally present, do not affect any component of the flow


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