CFD Online Discussion Forums

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   Main CFD Forum (https://www.cfd-online.com/Forums/main/)
-   -   lattice Boltzmann (again) (https://www.cfd-online.com/Forums/main/2507-lattice-boltzmann-again.html)

Pei-Ying Hsieh August 21, 2000 13:24

lattice Boltzmann (again)
 
Hi,

Can someone tell me how to relate the physical variables (real world variables) to the non-dimensional variables in the lattice Boltzmann equations (such as, viscosties, domain length, ime, density, velocities, surface tension,...)? Thanks!

For transient problem, is there a constraint on delta t? (delta t is 1 in LBE, right?)

Pei-Ying Hsieh

benjamin August 23, 2000 18:21

Re: lattice Boltzmann (again)
 
Hi, you could read

Naoki Takada, Michihisa Tsutahara Evolution of viscous flow around a suddenly rotating circular cylinder in the lattice boltzmann method Computers & Fluids vol 27 no 7 pp807-828 (1998)

you have to scale the viscosity (related to the relaxation parameter) with the time step and the space increment.



All times are GMT -4. The time now is 04:42.