Abstract.
This article is concerned with the numerical simulation of flows at low Mach numbers which are subject to the gravitational force and strong heat sources. As a specific example for such flows, a fire event in a car tunnel will be considered in detail. The low Mach flow is treated with a preconditioning technique allowing the computation of unsteady flows, while the source terms for gravitation and heat are incorporated via an operator splitting. It is shown that a first order discretization in space is not able to compute the buoyancy forces properly on reasonable grids. The feasibility of the method is demonstrated on several test cases.
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Birken, P. Numerical simulation of tunnel fires using preconditioned finite volume schemes. Z. angew. Math. Phys. 59, 416–433 (2008). https://doi.org/10.1007/s00033-007-6129-4
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DOI: https://doi.org/10.1007/s00033-007-6129-4