Adaptation of Pressure Based CFD Solvers for Mesoscale Atmospheric Problems

Kristóf, Gergely [Kristóf, Gergely (Áramlástan), author] Department of Fluid Mechanics (BUTE / FME); Rácz, Norbert [Rácz, Norbert (Áramlástan), author] Department of Fluid Mechanics (BUTE / FME); Balogh, Miklós [Balogh, Miklós (Áramlástan), author] Department of Fluid Mechanics (BUTE / FME)

English Article (Journal Article) Scientific
Published: BOUNDARY-LAYER METEOROLOGY 0006-8314 1573-1472 131 (1) pp. 85-103 2009
Conference: 6th International Conference on Urban Air Quality 2007-03-27 [Lemeszósz, Limasol, Cyprus]
  • SJR Scopus - Atmospheric Science: Q1
Identifiers
Subjects:
  • Earth and related Environmental sciences
General purpose Computational Fluid Dynamics (CFD) solvers are frequently used in small-scale urban pollution dispersion simulations without a large extent of ver- tical flow. Vertical flow, however, plays an important role in the formation of local breezes, such as urban heat island induced breezes that have great significance in the ventilation of large cities. The effects of atmospheric stratification, anelasticity and Coriolis force must be taken into account in such simulations. We introduce a general method for adapting pressure based CFD solvers to atmospheric flow simulations in order to take advantage of their high flexibility in geometrical modelling and meshing. Compressibility and thermal stratification effects are taken into account by utilizing a novel system of transformations of the field variables and by adding consequential source terms to the model equations of incompressible flow. Phenomena involving mesoscale to microscale coupled effects can be analyzed without model nesting, applying only local grid refinement of an arbitrary level. Elements of the method are validated against an analytical solution, results of a reference calculation, and a laboratory scale urban heat island circulation experiment. The new approach can be applied with benefits to several areas of application. Inclusion of the moisture transport phenomena and the surface energy balance are important further steps towards the practical application of the method.
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2022-09-27 17:17