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

Discretization

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 6, 2020, 10:01
Default Discretization
  #1
New Member
 
Daniel
Join Date: Jun 2019
Posts: 4
Rep Power: 7
Dan96 is on a distinguished road
Hello there,


i'm new in the CFD-community and have a question about discretization:


Is important when I discretize my differential equations? I want to calculate the convection diffusion equation numerically (velocity in convective Term approximated by Darcy's Law and diffusive Term approximated by Fick's Law).



Is it possible to avoid the product rule of differentiation (in the convective term the velocity and the concentration are both dependent on spatial coordinate) if I discretize the continuity equation before adding Darcy's and Fick's law? What are the consequences if I discretize my equations earlier?


Best regards


Dan
Dan96 is offline   Reply With Quote

Old   May 6, 2020, 14:21
Default
  #2
Senior Member
 
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,793
Rep Power: 71
FMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura aboutFMDenaro has a spectacular aura about
Quote:
Originally Posted by Dan96 View Post
Hello there,


i'm new in the CFD-community and have a question about discretization:


Is important when I discretize my differential equations? I want to calculate the convection diffusion equation numerically (velocity in convective Term approximated by Darcy's Law and diffusive Term approximated by Fick's Law).



Is it possible to avoid the product rule of differentiation (in the convective term the velocity and the concentration are both dependent on spatial coordinate) if I discretize the continuity equation before adding Darcy's and Fick's law? What are the consequences if I discretize my equations earlier?


Best regards


Dan



I don't understand clearly your question. However, you have to follow the coupling dictated by the differential equations.
FMDenaro is offline   Reply With Quote

Reply

Tags
continuity equation, discretization

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
Conservative discretization arungovindneelan Main CFD Forum 1 July 4, 2019 03:22
chemical species spatial discretization mahmoudtmt FLUENT 2 March 6, 2017 18:17
what are space discretization errors and time discretization errors? HotSQuidY FLUENT 0 October 19, 2013 00:44
Grid Independence with discretization schemes saisanthoshm88 CFX 19 May 22, 2013 10:10
Space and time discretization of Euler equation Hooman Main CFD Forum 2 June 6, 2010 08:30


All times are GMT -4. The time now is 22:28.