2D Steady-State Analysis Geometry It is better to construct your own 2D geometry in Design Modeler. Modifying and optimizing geometry will be easier than importing a modified geometry every time you need to modify. At least named selections in Mesh ICEM software will be preserved unless affected by the changed. Design modeling is a parametric modeler where dimensions can be modified, and constraints can be added. Mesh One way to create a good-quality orthogonal mesh is the following: In Design Modeler, go to tools > face split. Split your geometry into faces as needed. In ICEM, insert MultiQuad Zone.. choose all quad ..continue Insert edge sizing. Choose edges of interest.. continue Always refine mesh at areas where flow is subject to significant changes like constrictions and flow diverting elements. A rule of thumb for constrictions is to create at least 10 grids in between the constriction walls. Setup Methods Coupled solver has performed well with most high-pressure applications we’ve encountered. Always start with First-order discretization schemes. Once a stable solution is reached, increase discretization order as needed. Controls For all fields except Energy, always start with low under-relaxation factors (i.e., 0.1 or 0.3). Once a stable solution is reached, increase under-relaxation factors (i.e., 0.5 or 0.7) to get faster convergence. Under-relaxation factor for Energy should be normally high (0.98-1). It has been noticed, however, that this can be critical. Choosing this to be 0.98 can lead to convergence, while 1 can lead to divergence. So, start with 1, then go down to 0.98 if needed.
