Improve Convergence Using the Improve convergence option under advanced settings could benefit designs with long fluid paths or fine voxel meshes. Prepare your model for a Fluids analysis. Click the Custom Fluids Run satellite icon in the Analyze tool group. The Run Fluids Analysis window appears. Click the Advanced tab. Turn on Improve convergence. Right-click and mouse through the check mark to exit, or double-right-click. Rerun the simulation.