[Ranulph]

I'm new to CFD and have a slightly unusual CFD problem to solve. In essence I need to model water flowing over and around a pipe containing compressed air which has a small hole in it, so a stream of air is exiting the pipe and interacting with the water flowing over/around the pipe. (That's it in a very simplified nut shell anyway).

Is there a way to model this in openfoam? I'm not sure how to specify two different fluids and also how to have two fluids entering the simulation. Could I just specify that the interior of the pipe is a certain pressure and not have to define an incoming and outgoing flow?

Thanks in advance.

[arjun]

Originally Posted by Ranulph

I'm new to CFD and have a slightly unusual CFD problem to solve. In essence I need to model water flowing over and around a pipe containing compressed air which has a small hole in it, so a stream of air is exiting the pipe and interacting with the water flowing over/around the pipe. (That's it in a very simplified nut shell anyway).

Is there a way to model this in openfoam? I'm not sure how to specify two different fluids and also how to have two fluids entering the simulation. Could I just specify that the interior of the pipe is a certain pressure and not have to define an incoming and outgoing flow?

Thanks in advance.

Not sure about openfoam but its trivial in Wildkatze.

[esma]

Not sure if I understood the problem you described correctly. But if you need to simulate air and water interactions, you'd have a multiphase problem (VOF) that you can solve using interFoam. In geometry you need to define two inlets. Inlet1 is water flow that you define velocity or flow rate boundary and inlet2 is defined at the hole as air velocity or flow rate. The outlet boundary is pressure outlet boundary. If the nature of the problem is time dependant you need to apply transient (interFoam) but if that can be said eventually reaches a steady state solution you can use interFoam-LTS.

[Ranulph]

Originally Posted by esma

Not sure if I understood the problem you described correctly. But if you need to simulate air and water interactions, you'd have a multiphase problem (VOF) that you can solve using interFoam. In geometry you need to define two inlets. Inlet1 is water flow that you define velocity or flow rate boundary and inlet2 is defined at the hole as air velocity or flow rate. The outlet boundary is pressure outlet boundary. If the nature of the problem is time dependant you need to apply transient (interFoam) but if that can be said eventually reaches a steady state solution you can use interFoam-LTS.

That's a great help. Thank you so much!