can ANSYS create the fillet region between two curved surfaces?

[William Lu]

Dear all,

I am creating a solid model of a centrifugal compressor impeller. I
have one tough question - how I can create the fillet region between
the airfoil root and the hub. As you know, the airfoil face is
usually a cuved surface, and hub face is a curved face too, and the
airfoil has been welded together with the hub. What is more, from the
inlet to the outlet, the fillet radius varies.

If we research this issue from a simple case, then we can considering
adding a fillet volume in the intersection of two solid cylinders.
Does anybody have experience in this field. I would greaatly
appreciate if you can share.

Thanks in tons,

William

[Martin Liddle]

Post by William Lu
I am creating a solid model of a centrifugal compressor impeller. I
have one tough question - how I can create the fillet region between
the airfoil root and the hub. As you know, the airfoil face is
usually a cuved surface, and hub face is a curved face too, and the
airfoil has been welded together with the hub. What is more, from the
inlet to the outlet, the fillet radius varies.
If we research this issue from a simple case, then we can considering
adding a fillet volume in the intersection of two solid cylinders.
Does anybody have experience in this field. I would greaatly
appreciate if you can share.

If you are talking about the solid modeller in prep7 then I don't think
you can do it in an elegant way. Best advice is to use ANSYS Design
Modeller or a CAD package and import the filleted geometry into ANSYS.
If you must do it in ANSYS then one approach is to the two intersecting
areas into a number of strips with the working plane. The lines at the
edges of these strips can then be line filleted. I have done this
several times but it is messy and time consuming.

[Brent Strahan]

Post by William Lu
I am creating a solid model of a centrifugal compressor impeller. I
have one tough question - how I can create the fillet region between
the airfoil root and the hub. As you know, the airfoil face is
usually a cuved surface, and hub face is a curved face too, and the
airfoil has been welded together with the hub. What is more, from the
inlet to the outlet, the fillet radius varies.

ANSYS doesn't do complicated modelling very well in my opinion. If I
had the opportunity I would (and have done in the past with ANSYS) do
all the modelling in either IDEAS or SolidWorks then import it to
ANSYS as an IGES.

Can you estimate this variable fillet with a series of cylindrical
sections? ANSYS is going to mesh it anyway, so you're not necessarily
losing geometric detail. Can you use spirals?

[hardlu]

Dear Brent, Thanks for reply. The problem is that I am writting a
program based on ANSYS' APDl to
automatically create the whole solid model and FE model for the
impeller. So, doing it in CAD programs like Solidworks is impossible,
or not in line with my expectation.

Thanks.
William.

Post by Brent Strahan

Post by William Lu
I am creating a solid model of a centrifugal compressor impeller. I
have one tough question - how I can create the fillet region between
the airfoil root and the hub. As you know, the airfoil face is
usually a cuved surface, and hub face is a curved face too, and the
airfoil has been welded together with the hub. What is more, from the
inlet to the outlet, the fillet radius varies.

ANSYS doesn't do complicated modelling very well in my opinion. If I
had the opportunity I would (and have done in the past with ANSYS) do
all the modelling in either IDEAS or SolidWorks then import it to
ANSYS as an IGES.
Can you estimate this variable fillet with a series of cylindrical
sections? ANSYS is going to mesh it anyway, so you're not necessarily
losing geometric detail. Can you use spirals?