Mid surface creation

Submitted by raghav2984 on Tue, 08/20/2019 - 20:09
Forums: 
Journaling / NXOpen API

Dear All,

I need to create a mid surface on a airfoil. I have the solid model of the airfoil and I tried mid surface option with the "point cloud" option, most of the surfaces are fine except at the edges where the airfoil surface angle changes steep. I cannot divide blade into multiple sections as I need the mid section to be consistent/continous profile. I also need to develop a NXOpen automation later. Looking forward for some advice from your experience.

Regards,

Raghav

metin_mehel - Wed, 08/28/2019 - 08:08

I think you should trim solid at LE and TE. After that you can utilise midsurface better. You can also extend midsurface inorder to provide LE and TE portion.

raghav2984 - Mon, 09/16/2019 - 18:21

Thank you for the reply Metin. I have issue in using the midsurface option because I the mid surface throughout the airfoil including the wedges. As the curvature changes drastically at the interface, the surface always intersect with the body. I used the pointcloud option in midsurface method, still the surface is offsetted to one side. I tried to program and get the mid points and I intend to use the nsidedsurface. The main issue with this is, I couldn't automate the process as I need to change the interior section's direction. If I could get some help on this, I would be able to complete my task.

Looking forward for some suggestions as I couldn't get any help in GTAC.

Regards,
Raghav, PhD (Precision Manufacturing and Automation)
NUS

hebmwo - Wed, 10/02/2019 - 01:53

Dear raghav2984,
an idea for creating the midsurface can be if you first split the face of the solid in two sides (low pressure side, pressure side).
Then for example create 10 stream curves along the airfoil blade with isoparametric curves (U/V). From the resulting curve from low pressure side and pressure side create the centerline curve (code see link below)

http://www.nxjournaling.com/content/get-curve-centerline2dbuilder

Using the 10 centerline curves of the streamcurves you can create your middle surface with Mesh Surface\Through curves