Three-dimensional multidomain lattice Boltzmann grid refinement for passive scalar transport

Area of Science:

• Computational fluid dynamics
• Multiphase flow simulations

Background:

• Accurate simulation of passive scalar transport is crucial in various scientific and engineering fields.
• Existing methods face challenges in handling multiresolution grids and coupling fluid flow with scalar transport.

Purpose of the Study:

• To develop and validate a novel algorithm for simulating passive scalar transport on 3D multiresolution grids.
• To combine fluid flow and scalar transport modeling efficiently using a double distribution function approach.

Main Methods:

• Utilized the single relaxation time lattice Boltzmann method for simulations.
• Implemented a double distribution function approach for coupled fluid flow and scalar transport.
• Developed a 3D scaling technique and 2D bicubic interpolation for grid interface coupling.

Main Results:

• Validated the algorithm using three benchmark cases: forced convection in a 3D channel, natural convection in a cubical cavity, and turbulent channel flow with heat transfer.
• Achieved good agreement between simulation predictions and existing data.
• Demonstrated the method's capability in handling complex 3D domains.

Conclusions:

• The proposed lattice Boltzmann method algorithm is effective for simulating passive scalar transport in 3D multiresolution grids.
• The developed techniques for grid coupling and combined modeling are robust and accurate.
• This work provides a reliable computational tool for studying scalar transport phenomena.