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Normal vector to a selected boundary

Posted 2023年11月3日 GMT+1 23:04Computational Fluid Dynamics (CFD), Geometry, Material Models2 Replies

Adebayo Sadiq
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Hi ALL,

What is the expression for the normal vector to aselected boundary? For instance, I tried plotting the velocity vector normal to a selected boundary using (v.nx)>0 to represent y-component velocity in the upward direction but I did not get the expected result.

Thank you.

2 Replies Last Post 2023年11月7日 GMT+1 01:08
Robert Koslover Certified Consultant
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Posted: 10 months ago 2023年11月4日 GMT+1 00:10
Updated: 10 months ago 2023年11月4日 GMT+1 00:10

The normal vector on the surface is given by. If you have a vector field given by, then the component of that field that is along the normal to the aforementioned surface is given by its scalar product with that surface normal vector, i.e.,. (In 2D, use two components instead of three.)

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Scientific Applications & Research Associates (SARA) Inc.
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The normal vector on the surface is given by (nx,ny,nz). If you have a vector field given by (Vx,Vy,Vz), then the component of that field that is along the normal to the aforementioned surface is given by its scalar product with that surface normal vector, i.e., nx*Vx+ny*Vy+nz*Vz. (In 2D, use two components instead of three.)
Adebayo Sadiq
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Posted: 10 months ago 2023年11月7日 GMT+1 01:08
Updated: 10 months ago 2023年11月7日 GMT+1 01:07

The normal vector on the surface is given by (nx,ny,nz). If you have a vector field given by (Vx,Vy,Vz), then the component of that field that is along the normal to the aforementioned surface is given by its scalar product with that surface normal vector, i.e., nxVx+nyVy+nz*Vz. (In 2D, use two components instead of three.)

Thank you so much! This perfectly solved my concern.

>The normal vector on the surface is given by (nx,ny,nz). If you have a vector field given by (Vx,Vy,Vz), then the component of that field that is along the normal to the aforementioned surface is given by its scalar product with that surface normal vector, i.e., nx*Vx+ny*Vy+nz*Vz. (In 2D, use two components instead of three.) Thank you so much! This perfectly solved my concern.

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