topic Re: how to create rotating fluid domain in flowing fluid in CFD Forum

how to create rotating fluid domain in flowing fluid

Anonymous — Tue, 21 Nov 2017 03:39:43 GMT

Hi,

Please suggest how to create rotating fluid domain in flowing fluid.

Please explain i'm new to CFD

Regards

PNR

Re: how to create rotating fluid domain in flowing fluid

Jon.Wilde — Tue, 21 Nov 2017 05:50:07 GMT

Could you explain what you mean, why do you need a rotating fluid domain?

What are you modelling from reality?

Thanks,

Jon

Re: how to create rotating fluid domain in flowing fluid

Anonymous — Tue, 21 Nov 2017 13:38:52 GMT

Hi

I have rotating body inside fluid flow . I have doubt how create fluid
region for rotating body?

Regards
Pmr

Re: how to create rotating fluid domain in flowing fluid

matt.bemis — Tue, 21 Nov 2017 14:22:26 GMT

Hi @Anonymous,

Thanks for reaching out! Do you mean a rotating region? Have you seen the Centrifugal Pump tutorial? Are you specifically asking about modeling pumps/fans via rotating region?

Thanks,

Re: how to create rotating fluid domain in flowing fluid

Anonymous — Wed, 22 Nov 2017 05:06:52 GMT

Hi,

Thanks for reply. My specific case is horizontal kaplan turbine. As i have
hub and runner blades mounted, do i need to create rotating region and hub
or only to around blades. After this again do i need to create static
region around rotating region.
Please explain.

Thanks and regards
PNR

Re: how to create rotating fluid domain in flowing fluid

Jon.Wilde — Wed, 22 Nov 2017 06:40:42 GMT

Aha! Now we know what we are talking about, cool 🙂

Did you watch the webinar that Matt shared above? This will explain and also give you numerous other really important steps to take.

Re: how to create rotating fluid domain in flowing fluid

Anonymous — Sun, 03 Dec 2017 07:12:16 GMT

Hi,

How to get rpm of the machine from given inlet flow and water head.

Please suggest

Regards
PNR

Re: how to create rotating fluid domain in flowing fluid

Jon.Wilde — Sun, 03 Dec 2017 12:10:25 GMT

Did you see the guide already?

How far have you progressed through the analysis? This is possible by assigning this as free spinning with an inertia value and allowing the flow to move the impeller.

Re: how to create rotating fluid domain in flowing fluid

Anonymous — Mon, 04 Dec 2017 10:30:12 GMT

Hi,

Thanks for your reply, Its good Analysis is going on...

As i has to do Analysis at different guide vane openings.

I have only water head details at inlet and outlet and fixed RPM of rotor but i do not have data of water flow or Discharge details.

In your below email, you say as inertia values, what is this?

Regards

PNR

Re: how to create rotating fluid domain in flowing fluid

Jon.Wilde — Mon, 04 Dec 2017 11:38:49 GMT

Hold on, you do have the rpm value?

If this is the case, just use this and do not worry about the inertia.

The inertia is only required for flow driven analyses where you want CFD to calculate the rpm for you.

Or is your question 'what is intertia'?

Thanks,

Jon

Re: how to create rotating fluid domain in flowing fluid

Anonymous — Tue, 05 Dec 2017 03:22:13 GMT

Hi,

Thanks for your reply. If need any any clarifications will come back

Regards

PNR

Re: how to create rotating fluid domain in flowing fluid

Jon.Wilde — Tue, 05 Dec 2017 06:26:26 GMT

No problem - might you also mark one or more of these posts as a solution if they gave you the answer to your question?

Thanks,

Jon