Finally, it must be emphasized that the choice of a grid is extremely important because the stability and accuracy of the solution depend greatly on the size, orientation and geometrical characteristics of the grid elements.īecause of second order derivative terms and the differential nature of the relationship between variables, a dual grid will be necessary in addition to the regular grid to numerically model the differential equations. However, a limit of 8 sides is enforced within HEC-RAS for efficiency and saving memory. The solver does not have any inherent restrictions with respect to the number of sides of the polygonal cells. ![]() This will be covered in detail in the following section. However if orthogonality exists in all or part of the grid, the numerical solver will take advantage of it to improve computational speed. To provide the maximum flexibility, the 2D equation solver does not require the grid to be structured or even orthogonal. ![]() In order to efficiently take advantage of the numerical methods described later, the domain must be subdivided into non-overlapping polygons to form a grid.
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