The default method of displaying the velocity as a vector, as a dart on a transparent model. Often the gate or another narrow cross section has a very high velocity. The velocity in the rest of the part is displayed at the low end of the scale, making it difficult to see differences. Use the plot properties to scale the results to exclude the high velocity seen in narrow cross sections. When you select the check box, areas with a velocity higher than the displayed maximum are red.
It is recommended that you use the Cutting Plane post-processing tool to view velocity results inside the solid model. The velocity result recorded for the surface of the model will be zero. You will need to first define the cutting plane, and then move it through the model.
The velocity result can be used to determine areas with high or low flow rates. High velocity values for a section of a model indicates there is a high flow rate, meaning there could be shear heating problems. Very high local velocity values can cause the temperature to drastically increase in that area, resulting in surface blemishes, unbalanced filling, and packing and warpage problems.
If polymer flows quickly through one section of the mold, and flows slowly through another section of the mold, it could indicate filling defects such as hesitation or racetrack effects. Areas of the mold with very low velocities for most of the filling phase could indicate overpacking.