## Fluids

#### Conversion for boundary conditions.

• nivashsh
Subscriber
I am a student beginner tryin to simulate a room ventilation model. It has one inlet and two outletsThe experimental model has the following conditions,nmin= 0.064562 kg/snmout1= 0.044174 kg/s; the rest for mout2nTo best define the boundary condition I could convert min to Vin=0.053802(mass flow rate inlet to velocity inlet) Ain=0.55?0.7 mnHow could I best define mout1=0.044174 kg/s (Aout1=0.305?.254 m)and mout2(Aout2=0.254?0.254m)?nCould I convert these to pressure outlet conditions? If so kindly mention how. The material used is air.
• Rob
Ansys Employee
You have options, but cannot set a fixed flow for all three boundaries. So, given a known extract I'd suck the flow out of the domain and use a pressure inlet to let the solver balance. Alternatively, force in the inflow and ONE outflow leaving the other as a pressure outlet. If the density is known (and constant) I'd use velocity boundaries as they're marginally more stable. n
• Karthik R