[insisivus]

hello,
im conducting a centrifugal compressor-diffuser simulation, and i got stuck
when the compressor alone simulated, the results are good, but when it simulated with diffuser, the result is overflow

these are some details :

Compressor

• 8 blade
• 8 splitter
• radial tip
• currently simulated @73000rpm
• 1/8 model for simulation

Diffuser

• flat plate vanned diffuser
• +/- 55 blades
• 1/8 model for simulation

gap to shroud : 0,4mm

the problem is Overflow, i've tried to refine the mesh (make it smaller), get a better boundary condition, but it jus didnt work

can somebody help me, please ?

thx cfd-online

ps : sorry for my bad english