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

- - **convective boundary condition for outflow BC
**
(*https://www.cfd-online.com/Forums/main/13956-convective-boundary-condition-outflow-bc.html*)

convective boundary condition for outflow BC
Hi, all
I have used the convective BC for outflow condition in my code. However, I am not quite understand that how to set the outflow condition for a variable shear to the outlet. For instance, for an backstep test, the fluid flow from the left to right, and I set this direction as U(which is normal to the outlet), clearly, the U at outlet can be solved with CBC condition equation, Un[i] = U[i] - c*(U[i]-U[i-1])*dt/dx , c is some const speed My question is that how to solve the V and W at the outlet? Use the same way or just set them to zero? I have also heard that if the Peclet Number is huge, then we need no BC for the outflow, is it right? regards, shengyong |

Re: convective boundary condition for outflow BC
hi pang,
You must use the same procedure for v and w. Just replace v,w...inplace of u. thanks. |

All times are GMT -4. The time now is 22:39. |