topic Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow in CFD Forum

Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

Archershome — Wed, 15 Feb 2023 11:47:12 GMT

Hello everyone, I am working on a project of a water distribution tube, The pipe would have a volume flow entering at the pipe at one end and is blocked the other end. The pipe would have a line of distribution holes where the water would leave to atmosphere.

I am trying to establish the flow leaving each of the holes, I have a simulation that runs, but am experiencing negative flows at some of the outlet holes, and positives at some of the others.

Would anyone done a simulation like this, or could someone have a look at my simulation and pass comments. I am fairly new to the software.

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

karol.suchon — Wed, 15 Feb 2023 14:17:31 GMT

That happens becouse the software is not able to catch all the physics behind the process, you have a water spray here. When water leaves the pipe into the atmosphere it creates a cylinder of water, which increase the hydrostatic pressure, so you do not have atmospheric pressure on the outlet.

So there is no direct method to solve it, we could try to model the height of fluid via resistance bodies, but I need to find the eqaution of inlet velocity/height of fluid relation.

BR
Karol

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

Archershome — Wed, 15 Feb 2023 16:30:16 GMT

Hi Karol thanks, nice to see you still around.

By setting a resistance this would assume all outlets to have the same volume flow. I was hoping get the simulation to show the uneven distribution along the pipe, as you loss a small amount of volume along the length per hole.

Any way if you come to a solution let me know.

Thanks

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

karol.suchon — Wed, 15 Feb 2023 17:22:30 GMT

You should still get the distribution where near the inlet velocity will be higher, but applying resistance will decrease these effects. I will try to apply it and compare the outlet velocity and pressure distribution.

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

karol.suchon — Thu, 16 Feb 2023 13:43:55 GMT

Hello, you could check the file. After applying the resistance we have lesser velocity on the first opening and the velocity should have a more realistic distribution.
BR
Karol

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

Archershome — Thu, 16 Feb 2023 17:26:42 GMT

Hi there thank you downloading and running tonight.

Will keep you updated.

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

pazarbasioglu19 — Tue, 01 Jul 2025 10:41:30 GMT

Hello, I have faced the same problem. Can you please share whether the problem is solved or not? Also, I want to ask something about the solve section. How do you include hydrostatic pressure? Is it like the attached picture? I have marked hydrastatic pressure and entered z=-1 value on the z (vertical) axis.

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

jackswills004 — Wed, 02 Jul 2025 01:03:17 GMT

Simulate water flow from a perforated pipe using CFD tools to analyze pressure, velocity, and distribution patterns.

Re: Simulation Of Water Leaving a Pipe With Multiple Distribution Holes At A Volume Flow

TheCADWhisperer — Tue, 15 Jul 2025 11:49:26 GMT

@jackswills004

Can you attach an actual file to illustrate this?

You seem to have a wide range of knowledge across a wide range of topics; your input could be very helpful.