CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Special Topics > Mesh Generation & Pre-Processing

Characteristic mesh size in DDES simulation

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 27, 2021, 02:44
Default Characteristic mesh size in DDES simulation
  #1
New Member
 
Mattia Samiolo
Join Date: May 2021
Posts: 2
Rep Power: 0
mattia_samiolo is on a distinguished road
Good morning everyone,

I would want your opinion to build the correct mesh around a car, in my case I will use a k-omega SST DDES. I am aware that the measure of the mesh in the boundary condition has to start with a y+ value around 1 because of the SST model, but my concerns arise when the code switch to LES. What calculations or mind path do you use to estimate the mesh in the free stream?

As suggested by (Howard and Pourquie), the recommended mesh size in the detached flow regions for a DES-type simulation should be close to the Taylor microscale given by λ = 15^(1/2) A^( -1/2) Re^(-1/2)L, where A is an undetermined constant set to be 0.5 in this paper, L is the bulk integral scale (taken as the vehicle length, L), and Re the Reynolds number

Howard and Pourquie paper:
https://www.researchgate.net/publica...eference_model

Thank you
mattia_samiolo is offline   Reply With Quote

Reply

Tags
ddes, mesh, wake

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
[mesh manipulation] How to write cellSet for different regions in constant/polyMesh/sets Struggle_Achieve OpenFOAM Meshing & Mesh Conversion 3 June 17, 2019 10:29
Star CCM Overset Mesh Error (Rotating Turbine) thezack Siemens 7 October 12, 2016 12:14
[Gmsh] 2D Mesh Generation Tutorial for GMSH aeroslacker OpenFOAM Meshing & Mesh Conversion 12 January 19, 2012 04:52
OF 1.6 | Ubuntu 9.10 (64bit) | GLIBCXX_3.4.11 not found piprus OpenFOAM Installation 22 February 25, 2010 14:43
How to control Minximum mesh space? hung FLUENT 7 April 18, 2005 10:38


All times are GMT -4. The time now is 09:43.