A Midplane mesh consists of a web of 3-noded triangular elements and forms a 2D representation of a solid model. The local thickness of the part is added to each element to simulate the part volume.
This topic provides you with some Midplane mesh considerations.
Aspect Ratio
The aspect ratio of mesh elements can affect analysis performance. High aspect ratios can cause a slower analysis, and affect results. With the longest side in the direction of flow, the end node of high aspect ratio elements will add an excessive resistance factor to flow front calculations. Avoid very high aspect ratio triangles, which have their longest side in the direction of flow. If very high aspect ratios cannot be avoided, the longest side should, if possible, be at right angles to the flow direction.
Mesh Density
Increase the mesh density until there is no significant change in result detail. The best solution for controlling mesh density, is to apply a uniform mesh density across the part, and then refine the mesh in areas of interest. The mesh is often refined in areas where rapid changes in conditions occur (for example, at the gate).
In general there should be at least 2 elements across each surface. Around holes and other obstructions there should be at least 3 elements between the obstruction and the adjacent surface, so that weld lines and other transient effects are highlighted. The ideal mesh is sufficiently fine to enable reasonable accuracy and detail while not using excessive computer time. A fine mesh will give you more detailed results but will increase the analysis time.
Mesh Orientation
Mesh orientation is used to provide a consistent means of differentiating between the two sides of a two-dimensional, 3-noded element. The convention is to call one side of the element the top, and the other side the bottom.
When viewing the mesh orientation, the top side of the element is shown blue, and the bottom side is shown red. In general, for a Midplane model, the elements on one side should all be blue, or all be red.