|
[Sponsors] |
May 21, 2017, 15:45 |
Degrees of freedom of a domain
|
#1 |
Member
Katt
Join Date: May 2017
Posts: 30
Rep Power: 9 |
Hi;
This is a question out of curiosity after a discussion with my friend. If I have a domain that is spatially discretized, how can I compute the number of degrees of freedom that I have? Does this depend on the staggered or collocated grid arrangement or is only dependent on the domain geometry and spatial discretization? What is the significance of knowing the number of degrees of freedom in general? Thanks; Katt |
|
May 21, 2017, 15:53 |
|
#2 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,897
Rep Power: 73 |
In this case, degree of freedom and number of unknowns can be considered synonymous...
|
|
May 21, 2017, 21:03 |
|
#3 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,761
Rep Power: 66 |
Degrees of freedom is a measure of how complex or costly your computation is. It's a better measure than just cell count, because you can have a large grid and solve only a few number of transport equations, or you can have a small grid an d solve any equations. When you include chemical reactions for example, the number of species transport equations needed can increase very quickly. It also helps to count between scalar equations, vector equations, and tensor equations. When you only count by cells, these things don't show up.
|
|
Tags |
degrees of freedom |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Monte Carlo Simulation: H-Energy is not convergating & high Incident Radiation | volleyHC | CFX | 5 | April 3, 2016 06:41 |
[snappyHexMesh] No layers in a small gap | bobburnquist | OpenFOAM Meshing & Mesh Conversion | 6 | August 26, 2015 10:38 |
Setting rotating frame of referece. | RPFigueiredo | CFX | 3 | October 28, 2014 05:59 |
six degrees of Freedom.. NEED HELP! | DLC | OpenFOAM | 0 | July 29, 2010 09:57 |
Degrees of freedom | NGUYEN Viet Hung | FLUENT | 0 | July 9, 2006 20:59 |