[newbie384]

Hi

I am doing meshing for a centrifugal compressor with spliter blade and have a few questions that I hope that someone can kindly enlighten me.

1) I got the warning message as below.
"WARNING
The low theta blade was found not to be the longest blade. Improved Topology
may result from reversing the sense of the axis of rotation."

Do we always need to place our longest blade near to the low periodic boundary?

2) After importing the hub, shroud and blade curve, the starting points of shroud is connecting to a single point on the starting point of hub (Please see attached picture "outline.tiff"). I followed the rules stated in the user guide, i.e arrange the points for hub and shroud from upstream to downstream and I do not know why I got such a weird outline.

3) Can turbogrid generate mesh for inlet guide vane of centrifugal compressor like in the picture (igv.tiff)? There is no hub for the geometry. If cannot, what software is recommended?

Thank you.

[Far]

Originally Posted by newbie384

Hi

I am doing meshing for a centrifugal compressor with spliter blade and have a few questions that I hope that someone can kindly enlighten me.

1) I got the warning message as below.
"WARNING
The low theta blade was found not to be the longest blade. Improved Topology
may result from reversing the sense of the axis of rotation."

Do we always need to place our longest blade near to the low periodic boundary?

2) After importing the hub, shroud and blade curve, the starting points of shroud is connecting to a single point on the starting point of hub (Please see attached picture "outline.tiff"). I followed the rules stated in the user guide, i.e arrange the points for hub and shroud from upstream to downstream and I do not know why I got such a weird outline.

3) Can turbogrid generate mesh for inlet guide vane of centrifugal compressor like in the picture (igv.tiff)? There is no hub for the geometry. If cannot, what software is recommended?

Thank you.

You can do it seperatly in the turbogrid. But you have to be really smart while meshing components without hub. Just to give you an idea, you can tell TG that Inlet and outlet are hub and casing etc...

Also if your geometry is converging to a single point, then you can try ICEM CFD tetra or Quarter Ogrid in ICEM CFD hexa.