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Fluid Mechanics Problem Creating a Mesh

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Jan30-13, 02:25 PM
P: 1
We are beginning a project in my Intermediate Fluids class to make a program that can do aerodynamic analysis on an air foil. First, given any three nodal coordinates (x,y) of a triangle, we must write a program to compute its surface vectors and area of the triangle. The nodes will be in clockwise order.

I know I can compute the area through a determinant by doing A=0.5*det([1,1,1;x1,x2,x3;y1,y2,y3]); where 1, 2, and 3 denote each node and x and y are the coordinates.

Please help me start off my code or give insight to calculating the surface vectors.

Also, we will be using MATLAB.

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Jan30-13, 07:13 PM
PF Gold
boneh3ad's Avatar
P: 1,500
Well you know the direction from any one point to an adjacent point, right? Treat the line connecting those two as a vector and cross it with a vector coming "out of the page" from the same vertex you started with and you will get a mutually orthogonal vector. Then just normalize it and place it in the center of the line connecting your two points.

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