CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Particles following the flow trajectory

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

Like Tree10Likes

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 24, 2021, 09:19
Default
  #21
Senior Member
 
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,764
Rep Power: 71
FMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura about
Consider a pipe filled with water (single phase) being at the rest. This case is still compatible to produce a non-vanishing gradient of the density rho since


drho/dt +v .Grad rho = - rho div v



is satisfied for a zero velocity field. You can also write Drho/Dt=0 that means that a particle of water retain its density along the trajectory that, in this case, is just the position at the rest. Of course, the representation by means of the discrete particles depends on the number of finite particles of water you use.


You can do the same reasoning for water moving in the pipe, being now


drho/dt +v .Grad rho = Drho/Dt =0
Shabi likes this.
FMDenaro is offline   Reply With Quote

Reply

Tags
advection equation, particle concentration, transport equation, volume fraction.

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
Will the results of steady state solver and transient solver be same? carye OpenFOAM Running, Solving & CFD 9 December 28, 2019 05:21
How to simulate particles in a gas flow sara OpenFOAM Running, Solving & CFD 13 October 8, 2019 05:12
Choosing a solver to model particles at rest in a flow field Nigel Bruce Khan OpenFOAM Running, Solving & CFD 0 March 22, 2019 08:35
Particles in the flow nissen21 Fluent Multiphase 5 May 21, 2014 19:21
Interpolate particles together with flow asal FLUENT 0 March 30, 2014 14:22


All times are GMT -4. The time now is 10:13.