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Direct Numerical Simulation- for pipe flow

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Old   December 25, 2009, 12:02
Default Direct Numerical Simulation- for pipe flow
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Ramesh K
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Hi all,

I would like to know what DNS is all about...... how to go about writing a code for DNS for a pipe flow....

I went through a paper and got an idea that it is like spectral method applied to N-S equaitons...

if any one is familiar with DNS please let me know I want to have a genuine discussion with people working on DNS
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Old   December 25, 2009, 13:40
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DNS means the direct integration of the Navier Stokes equations, in essence:

- 3D unsteady simulation
- high order scheme for both the spatial and temporal parts of the NS equation
- huge computer power (for real life applications)

If all you need is a pipe simulation you probably will be able to use a structured mesh and a high order finite difference scheme. Depending on your Reynolds number you can simulate this on a single machine or if you have a big Re number on a cluster.
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Old   December 25, 2009, 14:41
Default Dns
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I have read in a paper on DNS simulation of a channel flow where in the unknown functions are expanded with a basis functions and the resulting equations are solved by integrating in time..

how many ways are there to solve DNS
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