Usage patterns
〈事〉が円滑に進むfor something to proceed smoothly
The meeting proceeded smoothly.
円滑な関係a smooth, friction-free relationship
The two countries have built a harmonious relationship.
円滑なコミュニケーションsmooth, friction-free communication
Smooth communication improves work efficiency.
円滑な運営smooth management/operation
We introduced a new system for smooth operation.
Expressions
円滑にするsmooth; harmonize; facilitate; streamline