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The chiller monitoring system meshing and boundary condition

The computational mesh thickness should fully consider the calculation of the correctness of the results and the calculated efficiency. But should first ensure the correctness of the calculation, so as to reflect the significance of the simulation. In addition, the thickness of the mesh also with the time step size selection. Especially for the explicit calculation, must satisfy the CFL condition to ensure the convergence of the calculation. Under the conditions of convergence of the calculation, if the mesh coarser within larger timestep rapid convergence; Conversely, finer grid in good convergence requires shorter time step. The time step length determines the time required to calculate the results. Therefore, should be selected within adequately capture the range of dimensions of the flow field characteristics (discontinuities) large size grid, which can increase the calculation time step and shorten the time required for the calculation. The meshing of the calculation of the structure shown in Figure 3.2. Channel grid size 1.5x1.5 mm, reflux chamber and the low-temperature exhaust cavity using a 2.0 × 2.5 n Shan, the import and export of the nozzle due to the cross-sectional area changes, using a gradient mesh size, import and export at the boundary of the grid 2. O × 2.0 mm, the nozzle opening grid of 1.0 × 1.5 mm. Grid a total of 60,120. Due to the overall size of the model, in order to reduce the grid the total number of the mesh size and the previous single-channel, multi-channel analog size compared increases. Simulation process, that is, to ensure that the port pressure and experimental values ??stable together, but also to ensure that the mass flow equal. The analog boundary conditions overdetermined. According to the work process analysis, reflux with high temperature ports pressure value is determined by the flow resistance determined by the flow resistance conditions. The flow resistance conditions can be adjusted in accordance with the installation of the experimental procedure, such as the flow area is increased, reducing the flow rate can be significantly reduced resistance. Two conditions for the flow resistance and quality of conservation, the more important that the conservation of mass, and hence, the calculation model is improved to guarantee the conservation of mass conditions of high temperature port and the return port.

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