MESH Clause Samples
MESH. We must now declare how many modules comprising the mesh INPUT of modules Hoop Radial elem tag Many of the generic meshes are basically the same the di erences lie in their bound aries In specifying the modules we do not consider either the boundary modules or the center fans since these require special x ups for the di erent cases Because the hole is inherently symmetrical choose a number of hoop modules that is divisible by Respond You are now asked INPUT Rmin exponent hollow full The rst is the inside radius while the second allows variation of the spacing of the modules in the radial direction For example it might be good to put a higher concentration of modules near the inside edge of the hole this would be achieved by specifying the exponent less than unity For now choose This gives equi spaced modules between and The outer boundary is currently circular but we can map it to a straight side MAP straight boundary as is map Choose to map and you are asked for NE N TYPE x y x y We just want a square outer boundary so type Meshes that are mapped may have elements with poor aspect ratio it is good practice in those situations to smooth or balance the element shapes In response to INPUT of smooth cycles type area coord reply because for the moment we want to see what an unsmoothed mesh looks like We also do not want to scale the mesh so respond As each of these generic meshes are being made it is advisable to use the utility PlotMesh to survey the results In particular you need to note the boundary node numbers Aligning Meshes There are a variety of ways that generic meshes can be combined some of the schemes are based on the information about their boundary nodes This information is stored at the end of each mesh le Thus the process could be made highly automated for some problems StaDyn NonStaD and GenMesh are designed for analyzing gen eral three dimensional structures and therefore the schemes implemented for merging meshes must also work in those general cases The basic idea is to rst align the sub structures as if they are to be physically welded and then attach the nearest nodes C genmesh m b m Sometimes a little iteration is needed in order to fully predict in the D cases where the rotations and translations will leave the new mesh Again this is a case were the use of a script le can help considerably The mesh with the hole need only be translated C genmesh m b m
MESH. To proceed and solve the problem it is necessary to divide the fluid domain into small cells, also referred as elements, with the purpose of treat each element as a single control volume where the suitable set of equations are solved. The solution of each cell, as well as the errors, are transferred to the neighboring elements in each iteration, until the convergence criteria is met. Obviously, the amount of either computational time or computational resources needed to reach the solution increases with the number of cells, but also a more accurate solution is achieved, thus the importance of creating an efficient and reliable mesh.
3.3.1 Approach In order to achieve the goals posed before, it has been proceeded to divide the fluid domain into different blocks, each one representing different zones of interest, enabling then to have high levels of refinement on those zones where smaller elements are needed to reach enough accuracy. Also, the subsequent blocks created are prisms, allowing then the sweep method of the ANSYS Workbench Mesher, which means that the mesh will be composed of hexahedral cells, which are quite more efficient than the otherwise employed tetrahedral cells [13]. The divided domain is shown in Figure 5, which precedes the consequent brief description of each block.
MESH. The mesh consists of 320.604 elements with an average quality of 0.4. The mesh is refined along the fault zones to simulate the reactivation process with accuracy. The remaining mesh is coarser.