Definition Element Coordinate System

In short you will need to define coordinate systems for each distinctly different orientation.

Definition element coordinate system. Therefore if you change the order of the grid points connectivity the direction of this positive normal might also reverse. Definition of two line element set coordinate system. In geometry a coordinate system is a system that uses one or more numbers or coordinates to uniquely determine the position of the points or other geometric elements on a manifold such as euclidean space. The orientation of the element coordinate system is determined by the order of the connectivity for the grid points.

Orthogonal coordinates therefore satisfy the additional constraint that 1 where is the kronecker delta. The symbol ρ rho is often used instead of r. Therefore the line element becomes 2 3 and the volume element becomes 4 5 6 7 8 where the latter is the jacobian the gradient of a function is. An orthogonal coordinate system is a system of curvilinear coordinates in which each family of surfaces intersects the others at right angles.

Then use the esys and or emodif commands to assign the coordinate systems to the relevant elements. Typical names you might be interested in might be mir or iss. The element z axis often referred to as the positive normal is determined using the right hand rule. For example a rough look at your discrete grids indicates you would need about 10 different coordinate systems for that case.