Differentially weighted direct simulation Monte Carlo method for particle collision in gas-solid flows

- A differentially weighted DSMC method was developed for particle collisions.
- Mono- and bidisperse high-inertia particle flows were simulated to validate the DW-DSMC method.
- The momentum conservation scheme proposed was able to conserve total mass, momentum and energy.
- Improved resolution was acquired using DW-DSMC, compared with equally weighted DSMC.
- Computational cost was largely reduced using DW-DSMC, compared to DNS.