[rvl565]

Originally Posted by Seroga

Hi!
I can't use that mesh because I can't understand how to apply it to this problem. It's larger than rotating part of Rotor and I don't know how to define rotating and stating parts in it. Maybe this is because my little experience in this field.

I have already built my own geometry and built my own mesh. It is very coarse because I just want to find out would it work at all. But I faces a problem of cyclic boundary conditions in OpenFOAM and stuck a bit.

I will write to this post as soon as I will obtain some positive results.

Hi,

Would it be possible for you to share your geometry with me? I could make another mesh and send that to you so that you can compare the results on your mesh with results on my mesh?

Thanks!

[Seroga]

Originally Posted by rvl565

Hi,

I can generate meshes for OpenFOAM using pointwise. I generated the following mesh, let me know if this is working for you,

https://drive.google.com/folderview?...28&usp=sharing

Your mesh still doesn't contain Group of Volumes that is defined like rotating part. That's why I can't define the rotatory speed for it.
My Skype is: seroga_mell.
You can find me and that would be, I think, an easier and quicker way to find a solution.

[vijaymali]

Originally Posted by rvl565

Hi,

I use pointwise for meshing and generate a hex mesh in the whole domain.

As per your comment on boundary conditions, I have read at many places that for fan simulations people generally use pressure inlet and vary the outlet static pressure to generate a PV curve. I thought this method is correct? If not, what is the advantage of using a mass flow inlet over using a total pressure inlet?

Hi RacMat,

I dont think there would much difference (in terms of output that you would get) in both the combinations. In one case, for given total P at inlet, static P at outlet and RPM, you would get mass flow rate. In other case, for give mass flow rate and static P at outlet, you would get total P at inlet. So every simulation would give you one point on characteristic curve (Flow rate vs. head).

Although in terms of output, its one and the same. But, there are guideline about most accurate to least accurate boundary conditions when it comes to CFD simulation. The total P and static P is at the top (more accurate and stable). So in that case, if the data is available, going for total P at inlet and static P at outlet would make lot of sense.

Thanks
Vijay

[rvl565]

Originally Posted by Seroga

Your mesh still doesn't contain Group of Volumes that is defined like rotating part. That's why I can't define the rotatory speed for it.
My Skype is: seroga_mell.
You can find me and that would be, I think, an easier and quicker way to find a solution.

when can we talk?

[Seroga]

Originally Posted by rvl565

when can we talk?

I have my Skype opened almost all day long. So you can write me any time you want.

Sure, I will give you my geometry model.

[rvl565]

just sent you a request on skype, could you share the geometry with me on google drive or something?

[rvl565]

https://drive.google.com/file/d/0BxN...it?usp=sharing

the mesh without the extended inlet and outlet

[rvl565]

Originally Posted by Seroga

I have my Skype opened almost all day long. So you can write me any time you want.

Sure, I will give you my geometry model.

Check you inbox if you havent done so already.

[andrei.cimpoeru]

Originally Posted by rvl565

Hi,

I can generate meshes for OpenFOAM using pointwise. I generated the following mesh, let me know if this is working for you,

https://drive.google.com/folderview?...28&usp=sharing

Hi rvl565

Can you please upload again the Pointwise files for the rotor67. I would appreciate your help. The link that you already got is expired.

Many thanks

Andrei

[ansab]

Originally Posted by rvl565

Pressure Inlet( total pressure defined ) with a pressure outlet ( static pressure defined) works well for me.
The way you generate the PV curve ( constant RPM ) for the fan is by increasing the outlet static pressure. higher the outlet static pressure less is the massflow rate.

Can you please also specify the values for these boundary conditions. Like what should be the value of Total Pressure at inlet ? and from which value we increase the Outlet static pressure ? In CFX Turbo there is also another value named Reference pressure, what to input there ?

M new with turbomachinery cfd and m stuck