- **Main CFD Forum**
(*http://www.cfd-online.com/Forums/main/*)

- - **buoyant term in vorticity equation
**
(*http://www.cfd-online.com/Forums/main/5159-buoyant-term-vorticity-equation.html*)

buoyant term in vorticity equation
Buoyant term in the vorticity transport equation is described as (Pr * Ra * dt/dx)
Discretizing this buoyant term, Pr * Ra * [T(i, j) - T(i-1, j)]/dx . In the simulation of the natural convection with bottom heating(T=1: bottom boundary, T=0: upper boundary), when we set the initial condition as isothermal T=0, then "T(i, j) - T(i-1, j)" is always zero, and convection does not begin for a long. How to treat this buoyant term and equations ? (Though I am not good at English, I will try to write as well as possible.) |

Re: buoyant term in vorticity equation
Junomian,
From the very start of your simulation, the dT/dx will not be zero close to the bottom boundary, because at the bottom boundary T=1 and the initial guess elsewhere is T=0. Therefore the convection effects, depending on the thermodynamic properties of the fluid and Ra value, should be clearly visible in your simulation. regards DML |

All times are GMT -4. The time now is 09:42. |