CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Does laminar model with sufficient resolution mean DNS

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By mkraposhin

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 15, 2020, 07:17
Default Does laminar model with sufficient resolution mean DNS
  #1
New Member
 
Visakh
Join Date: Dec 2010
Location: Bangalore, India
Posts: 7
Rep Power: 15
visakhmg is on a distinguished road
Hello everyone,


I am running a free convection (Rayleigh-Benard) simulation using buoyantPimpleFoam. Does a laminar model with sufficient grid & time resolution to resolve the Kolmogorov scales and boundary layers make it a DNS? The flow field is expected to be turbulent at the Rayleigh number I solve for. As far as I know, Direct Numerical Simulation means solving the original NS (+ energy) equations without any modeling terms for the turbulence, which is what laminar solver does.

Last edited by visakhmg; September 15, 2020 at 07:18. Reason: spellcheck
visakhmg is offline   Reply With Quote

Old   September 21, 2020, 12:36
Default
  #2
Senior Member
 
mkraposhin's Avatar
 
Matvey Kraposhin
Join Date: Mar 2009
Location: Moscow, Russian Federation
Posts: 355
Rep Power: 21
mkraposhin is on a distinguished road
Hi.

Theoretically - yes, but in practice - no. There are a lot of other things, which introduce errors - pressure-velocity coupling algorithm, BC's , etc.

In other words, when you use mesh with sufficiently fine resolution, the solution could tend to wrong due to approximation errors, which are not induced by discretization of equations terms.
cryabroad likes this.
mkraposhin is offline   Reply With Quote

Reply

Tags
buoyantpimplefoam, dns, turbule modelling, turbulence

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Turbulence model under laminar conditions mbranag CFX 12 March 13, 2023 20:06
interFoam wave propagation and explosion of Courant number and residuals ChiaraViola OpenFOAM Running, Solving & CFD 1 June 26, 2019 05:36
Is the laminar model in MultiphaseInterFoam the same as the DNS? Yujie Wang OpenFOAM Running, Solving & CFD 0 August 23, 2017 05:50
Laminar Kinetic Energy Model (Walters 2008) logoswort Fluent UDF and Scheme Programming 2 May 19, 2017 19:41
Question about grids for laminar model and turbulent model Anna Tian Main CFD Forum 0 March 3, 2013 19:44


All times are GMT -4. The time now is 23:43.