The Bubble radius result shows the size of bubble radius distribution across the part.
This result is generated from a Microcellular injection molding analysis for the following mesh types:
Midplane 
Dual Domain 
3D
Using this result
Ideally, the part should consist of uniformly distributed bubbles, and the radius of each bubble is consistent in size. Naturally, the radius of the bubble will be smaller around the gate area where the pressure is highest.
Through the control of the gas concentration injected into the polymer, the size of the bubbles either increases or decreases. Typically the recommended concentration of gas is about 0-1% of the part.
Note: For models with midplane or dual domain mesh types, the Bubble radius result is only available if the Number of profiled results specified in the solver parameters is greater than zero.
Things to look for
- The amount of bubble growth and the radius for each bubble depends on the amount of plastic injected versus the amount of gas concentration. If not enough gas is injected, the part will short shot. If too much gas is injected, it may cause a deterioration of the finished surface.