 ## Fluids

• Vanesa
Subscriber
Hello,nnI have to do a simple flow analysis in a piping system. There are two blowers sending air flow into a 7 seven storage tanks which are connected through pipes and are modeled as outlets. Whole system is modeled as pipes only. Blower outlets are modeled by giving mass flow inlet boundary condition as the flow rate is known at blower exit. The geometry is such that flow from blower1 and 2 will be coming together through one pipe and then it is branched to a header where again it is branched into 7 different pipes.nSuppose the flow rate at blower exit is 10 kg/s each (so total flow rate = 20 kg/s). So at all the outlets it should be 20/7 = 2.85 kg/s each if we do not consider any friction losses. nWhen I am modeling all the outlets as pressure outlets, the flow distribution is such that outlet 1 is getting maximum flow rate and outlet two he minimum. Other 5 are in medium range. Outlet 1 is giving the value more than 2.85 and outlet 2 gives less than 2.85. nI thought I will restrict the flow at outlet1 and 2 by giving mass flow outlet boundary condition and then specifying the desired mass flow rate value. Results showed a very uneven distribution which was not acceptable. Then I tried by giving target mass flow rate condition nut for which the same thing is happening.nI want flow rates to be 2.85 or nearby this value at each outlet. I can limit all outlets and get the result but physically it is not possible.nHow can I solve this?nThank you.n
• peteroznewman
Subscriber
nIt would be easier to follow your description if you inserted a sketch of the pipe network and labeled the inlets/outlets and the blowers.n
• Karthik R
• Vanesa
• Karthik R 