# Question on Lattice Boltzmann method

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

 June 19, 2019, 10:34 Question on Lattice Boltzmann method #1 Member   Join Date: Feb 2019 Posts: 65 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.

 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 OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post SHIKHA BHUYAN Main CFD Forum 4 September 10, 2017 23:02 levinperson Main CFD Forum 0 December 20, 2015 14:51 solemnpriest Main CFD Forum 3 August 12, 2013 11:00 anuhar Main CFD Forum 0 May 4, 2009 03:45 Daniel Main CFD Forum 0 January 17, 2008 07:45

All times are GMT -4. The time now is 20:00.