Unsteady Flow Initial Conditions
 

I am curious as to what the initial conditions within the setup initialization refers to. I have a domain with fluid flowing in at 29m/s in +U direction. If I set the initial condition to 29m/s does that mean the fluid entering the domain is traveling at that speed or does it mean the domain is traveling at that speed?

I want the domain to remain stationary, that is why I ask. I have been entering 0 for U, V, W and it takes a while for the solution to converge but it also looks like the solution is starting with the fluid flow at 0 then speeding up to 29.

Thanks for your insight.

Brady

Initialization refers to the entire domain. So if your initial velocity is 29 m/s, the entire domain will experience this simultaneously. It your initial velocity is 0 and the inlet velocity is 29 m/s, the simulation will take longer since the flow will have to first travel from the inlet to your region of interest.