tailieunhanh - Applied Computational Fluid Dynamics Techniques - Wiley Episode 1 Part 5

Tham khảo tài liệu 'applied computational fluid dynamics techniques - wiley episode 1 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 86 APPLIED COMPUTATIONAL FLUID DYNAMICS TECHNIQUES - Construct a quad octree for the points - Order the elements according to decreasing volume . in a heap-list - Construct a linked list for all the elements surrounding each point - do Loop over the elements in descending volume testing - if the element denoted in the following by ielem has not been marked for deletion before - Obtain the minimum maximum extent of the coordinates belonging to this element - Find from the quad octree all points falling into this search region storing them in a list lclop 1 nclop - Find all the unmarked elements with smaller volume than ielem surrounding the points stored in lclop 1 nclop this yields a list of close elements lcloe 1 ncloe - Loop over the elements stored in lcloe 1 ncloe - if the element crosses the faces of or is inside ielem Mark ielem for deletion endif endif enddo The reason for looping over the elements according to descending volumes is that the search region is obtained in a natural way the extent of the element . Looping according to ascending volumes would imply guessing search regions. As negative elements could lead to a failure of this test the overlap test is performed after the negative elements have been identified and marked. The test for overlapping elements can account for a large portion of the overall CPU requirement. Therefore several filtering and marking strategies have to be implemented to speed up the procedure. The most important ones are as follows. Column marking The mesh crossing test is carried out after all the negative badly shaped and large elements have been removed. This leaves a series of prismatic columns which go from the surface triangle to the last element of the original column still kept. The idea is to test the overlap of these prismatic columns and mark all the elements in columns that pass the test as not requiring any further crossing tests. In order to perform this test we subdivide the prismatic columns into three .

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