ライブラリ登録: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

A MODIFIED APPROACH TO THE LATTICE BOLTZMANN MODEL (LBM) BASED ANALYSIS OF RADIATIVE HEAT TRANSPORT

Get access (open in a dialog) DOI: 10.1615/IHTC16.rti.023868
pages 8429-8438

要約

The Lattice Boltzmann Model (LBM) has been applied in the literature for the direct solution of the Radiation Transfer Equations (RTE), based on the similarity between the RTE and the Boltzmann Transport Equation. Using this approach, intensities of radiation play the part of the particle distribution functions in LBM. A drawback of this technique involves the need for a large number of directions (a high level of angular discretization) especially for the case of optically thin media (small values of the extinction coefficient). Achieving increased discretization in the angular direction is non-trivial, involves a loss of locality of calculation and is characterized by increased particle velocity values. We present a modification, based on interpolation of intensities between nodes, in which high quality quadrature is used for the angular discretization, and locality as well as magnitude of particle velocities is not significantly affected. Sample results shown here demonstrate the robustness and accuracy of our approach as well as its importance, especially for low extinction coefficient values.