TY - GEN

T1 - Capturing aerosol droplet nucleation and condensation bursts using PISO and TVD schemes

AU - Frederix, E.M.A.

AU - Kuczaj, Arkadiusz K.

AU - Nordlund, M.

AU - Geurts, Bernardus J.

PY - 2014/7/20

Y1 - 2014/7/20

N2 - A mathematical model for single-species aerosol production and transport is formulated, and solved using an adapted PISO algorithm. The model is applied to a laminar flow diffusion chamber, using a finite volume method on a collocated grid. In tran- sient simulations, a sharp scalar front (e.g., vapor mass fraction), is shown to introduce unphysical oscillation in the solution, when applying a second order linear interpolation in the convective terms. At increased grid resolution, these oscillations are strongly at- tenuated. When applying a TVD scheme (here the MUSCL scheme), a time-accurate monotonicity-preserving solution is obtained. The numerical dissipation introduced by the MUSCL scheme implies increased spatial resolution to restore high accuracy levels. We develop a one-dimensional grid refinement algorithm, which relates the grid density in one direction to the magnitude of the scalar gradient. In combination with the MUSCL scheme, this gives accurate results, with a significant reduction in computational effort, in comparison with a uniform fine grid.

AB - A mathematical model for single-species aerosol production and transport is formulated, and solved using an adapted PISO algorithm. The model is applied to a laminar flow diffusion chamber, using a finite volume method on a collocated grid. In tran- sient simulations, a sharp scalar front (e.g., vapor mass fraction), is shown to introduce unphysical oscillation in the solution, when applying a second order linear interpolation in the convective terms. At increased grid resolution, these oscillations are strongly at- tenuated. When applying a TVD scheme (here the MUSCL scheme), a time-accurate monotonicity-preserving solution is obtained. The numerical dissipation introduced by the MUSCL scheme implies increased spatial resolution to restore high accuracy levels. We develop a one-dimensional grid refinement algorithm, which relates the grid density in one direction to the magnitude of the scalar gradient. In combination with the MUSCL scheme, this gives accurate results, with a significant reduction in computational effort, in comparison with a uniform fine grid.

KW - MACS-MMS: Multiscale Modelling and Simulation

KW - METIS-309823

KW - IR-93884

KW - EWI-25587

M3 - Conference contribution

SN - 978-84-942844-7-2

SP - 3462

EP - 3472

BT - Proceedings of the 6th European Conference on Computational Fluid Mechanics, ECFD 2014

PB - European Community on Computational Methods in Applied Sciences

CY - Barcelona, Spain

Y2 - 20 July 2014

ER -