Again under the Simulator → Grid rollout: Set Adaptive Grid to Speed. The Adaptive Grid algorithm updates the size of the simulation's bounding box to accommodate the movement of the simulated contents (e.g. Smoke rising up). Set the Threshold to 20 - the Threshold value specifies the minimum value a Cell near the outer edges of the box must be for the Adaptive Grid algorithm to kick in and resize the Simulator. When the Adaptive Grid is set to Speed, with a Threshold of 20, the Velocity channel of the simulation near the outer edges should be of magnitude of at least 20. Set the Extra Margin to 1 - by default, the Adaptive Grid algorithm tries to expand the simulator to accommodate the movement of the contents inside. However, if the content is moving very quickly (e.g. an explosion, hot smoke, etc.), the simulator may not expand enough and clipping may occur. The Extra Margin option can be used to force an additional number of voxels around the walls to give the fluid a bit more room if the Adaptive Grid can't keep up with the simulation. Under Grid→ Manual Adaptation Limits, select Enable Limits and set the maximum size of the simulator to [ 20, 20, 120, 0, 20, 20 ]. |