Direct Numerical Simulation- for pipe flow

RameshK · December 25, 2009, 11:02

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

DoHander · December 25, 2009, 12:40

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.

RameshK · December 25, 2009, 13:41

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

December 25, 2009, 11:02	Direct Numerical Simulation- for pipe flow	#1
RameshK Member Ramesh K Join Date: Dec 2009 Location: IIT chennai Posts: 51 Rep Power: 5	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

December 25, 2009, 13:41	Dns	#3
RameshK Member Ramesh K Join Date: Dec 2009 Location: IIT chennai Posts: 51 Rep Power: 5	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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December 25, 2009, 12:40		#2
DoHander Senior Member Join Date: Nov 2009 Posts: 409 Rep Power: 8	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.