Question: Inlet / Outlet with multiple fluids

[FloWsnr]

Hi,

First of all, thank you for your amazing work here.
I want to simulate multi-fluid systems in closed channels. An incoming fluid should displace an already present fluid. The incoming fluid should enter the simulation with a constant velocity.
I tried to use inlets and outlets for that, however, I ran into some problems. How can the inlet produce fluid_1 while the outlet "erases" fluid_2 and eventually fluid_1.

Thank you for your help,

Florian

[pawansnegi]

Hi Florian,

Thank you for your kind words!

The inlet in PySPH is implemented such that the same particles are circulated in the inlet domain. See

pysph/pysph/sph/bc/inlet_outlet_manager.py

Line 586 in 9cb9a85

def update(self, time, dt, stage):

Therefore in order to create inlet with different property compared to the properties of the rest of the domain, create the inlet and rest of the domain with that values. See the inlet initialisation here

pysph/pysph/examples/flow_past_cylinder_2d.py

Line 232 in 9cb9a85

def _create_inlet(self):

And corresponding fluid and outlet initialisation in the same example.

I hope this helps!

Regards,
Pawan

[prabhuramachandran]

Am closing this for now, if there is a bug please reopen or a file a specific issue. Thanks.