CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Visualization & Post-Processing Software > Tecplot

Particle Pathline: User Manual Doubt

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 25, 2019, 05:37
Question Particle Pathline: Missing Pressure Gradient Term
  #1
New Member
 
Join Date: May 2015
Posts: 5
Rep Power: 11
Pravaah is on a distinguished road
This is regarding particle pathline calculation procedure mentioned in Tecplot's user manual. https://www.tecplot.com/documentation/

So my question is regarding the procedure adopted there:
the first step is to generate streamlines and then mention values for velocity components, mass, radius and drag coefficient.

Why pressure values are not being taken as input?
Even in the documentation, there is no mention of contribution, in particle's acceleration, by the pressure gradient.

Last edited by Pravaah; April 26, 2019 at 06:48.
Pravaah is offline   Reply With Quote

Old   April 26, 2019, 20:25
Default
  #2
New Member
 
Dave Taflin
Join Date: Nov 2017
Posts: 12
Rep Power: 8
davetaflin is on a distinguished road
The density of the particles is assumed to be much larger than the density of the fluid, making pressure forces unimportant. See FLUENT's explanation of this here: https://www.sharcnet.ca/Software/Ans...le_motion.html
davetaflin is offline   Reply With Quote

Old   April 28, 2019, 09:41
Default
  #3
New Member
 
Join Date: May 2015
Posts: 5
Rep Power: 11
Pravaah is on a distinguished road
Many thanks for reply



I had one counter question:

What you are saying is true for Fluent.

What about Tecplot? because there is no mention of any such assumption.


Why do they calculate stramlines first? Is it for inital guess of path only?
I was thinking if it gets density and velocities then it can easily calculate pressure gradients for those terms.
Pravaah is offline   Reply With Quote

Reply

Tags
pathlines, pressure gradient, user manual

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
How to plot a single particle pathline in FLUENT shashanktiwari619 FLUENT 0 June 24, 2017 00:59
injection problem Mark New FLUENT 0 August 4, 2013 01:30
particle user routines Felix CFX 1 July 24, 2006 12:32
Particle Injection User Fortran Routine Adam CFX 5 December 13, 2005 03:16
confused about particle user source sub-routine wayne CFX 1 August 30, 2005 06:55


All times are GMT -4. The time now is 02:07.