6533b829fe1ef96bd128af85
RESEARCH PRODUCT
Moment‐based boundary conditions for straight on‐grid boundaries in three‐dimensional lattice Boltzmann simulations
Koulis PericleousI. KrastinsTimothy ReisA. Kaosubject
PhysicsApplied MathematicsMechanical EngineeringMathematical analysisComputational MechanicsLattice Boltzmann methodsSlip (materials science)GridCollision01 natural sciences010305 fluids & plasmasComputer Science Applications010101 applied mathematicsTest caseMechanics of MaterialsLattice (order)0103 physical sciencesBoundary value problem0101 mathematicsQAdescription
In this article, moment‐based boundary conditions for the lattice Boltzmann method are extended to three dimensions. Boundary conditions for velocity and pressure are explicitly derived for straight on‐grid boundaries for the D3Q19 lattice. The method is compared against the bounce‐back scheme using both single and two relaxation time collision schemes. The method is verified using classical benchmark test cases. The results show very good agreement with the data found in the literature. It is confirmed from the results that the derived moment‐based boundary scheme is of second‐order accuracy in grid spacing and does not produce numerical slip, and therefore offers a transparent way of accurately prescribing velocity and pressure boundaries that are aligned with grid points in three‐dimensional.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-06-02 | International Journal for Numerical Methods in Fluids |