|
[Sponsors] |
June 19, 2019, 11:34 |
Question on Lattice Boltzmann method
|
#1 |
Member
Join Date: Feb 2019
Posts: 69
Rep Power: 7 |
Hi I am still learning about LBM. However one thing that confuses me is the physical speed and sound speed. For the lattice sound speed cs=1/sqrt{3}, does it correspond to the physical sound speed for isothermal flow (sqt{RT}) ? If it does, then why isn't the physical speed (e.g. inlet speed of lid cavity) up converted accoringly? Like for instance,
cp=sqt{RT}≈330m/s --> cs=1/sqrt{3}≈0.5774 Then why isn't the physical speed u map accordingly e.g. physical speed of inlet(lid) is up=0.2m/s --> converted to ul=0.3*0.5774/330 Instead the physical speed up is used together with the lattice speed of sound cs in the flow equilibrium distribution. I may have miss something but for now I am really stuck at this part. |
|
Tags |
boltzmann equation, distribution function, incompressible flow, lattice boltzmann method, lbm |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Lattice Boltzmann method_Thermal Poiseuille flow | SHIKHA BHUYAN | Main CFD Forum | 4 | September 11, 2017 00:02 |
A fundamental question on FDF (Filtered density function) method for turbulent flow | levinperson | Main CFD Forum | 0 | December 20, 2015 15:51 |
Lattice Boltzmann method vs Finite Element Method and Finite Volume Method | solemnpriest | Main CFD Forum | 3 | August 12, 2013 12:00 |
Periodic BC's for Thermal Lattice Boltzmann Method | anuhar | Main CFD Forum | 0 | May 4, 2009 04:45 |
How to predict turbulence with Lattice Boltzmann? | Daniel | Main CFD Forum | 0 | January 17, 2008 08:45 |