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: Bangalore Posts: 73 Rep Power: 16	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: Bangalore Posts: 73 Rep Power: 16	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
flow over a cylinder urgent!	kevin	FLUENT	8	August 11, 2015 13:00
how to set up high temperature gas turbine flow simulation?	adam2008	CFX	1	July 22, 2009 18:33
Simulation of Flow through Complex 3D Geometry	EmersonKB	CFX	5	July 2, 2009 08:17
flow simulation across a small fan	jane luo	Main CFD Forum	15	April 12, 2004 17:49
Solid-Liquid Two Phase Flow Numerical Simulation with the Finite Element Method	Qing Hao	Main CFD Forum	2	January 8, 1999 23:31

December 25, 2009, 12:40		#2
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 19	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.