centrifugal compressor with vaneless diffuser

sima101f 4 months ago

Hello

I have created my centrifugal compressor with vanelles diffuser in cfturbo. when i try to import design in Autogrid it recognizes it as single row. Can somone please explain how can i have sepeate row for impeller and vaneless diffuser. Or is it okay to simulate as one ?

Thanks

0 gs_cfd_cdn 4 months ago

Hi,

Which platform you are using Fidelity or Fine and which version?
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0 sima101f 4 months ago in reply to gs_cfd_cdn

Hi,

i am using FINE
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0 gs_cfd_cdn 4 months ago in reply to sima101f

Yes you can use both at one time. Import as External CAD in Autogrid using Import CAD option. Link the vane and diffuser separately to blade and diffuser
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0 sima101f 4 months ago in reply to gs_cfd_cdn

Thank you very much for yor response. I have started them as single row. In the boundary conditions under the solid tab, i split the hub and define imepller hub as rotating and diffuser hub as non rotating. My mesh quality is good and boundary conditions are right too but still i am unable to run the simulation. As soon as simulation starts density and pressure goes to negative. any thoughts on that ?
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0 Colinda 3 months ago in reply to sima101f

The vaneless diffuser is axisymmetric? You may want to run a simulation with 0 iterations and check where in the field it is so unphysical that it causes negative density and pressure so rapidly. Check the velocity on the solid walls and the quantities on inlet and outlet to check that it really matches what you needed. The direction of rotation of the vanes is correct?
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centrifugal compressor with vaneless diffuser

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