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Development of a Lagrangian Temperature Particles Method to Investigate the Flow Around a Rough Bluff Body

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Udgivet i:Fluids vol. 10, no. 11 (2025), p. 288-307
Hovedforfatter: Carvalho Gabriel Ferraz Marcondes de
Andre forfattere: Chiaradia, Tiago Raimundo, Gava Filho Victor Hugo, Moraes Paulo Guimarães de, Bimbato Alex Mendonça, Alcântara Pereira Luiz Antonio
Udgivet:
MDPI AG
Fag:
Heat transfer
Circular cylinders
Simulation
Velocity
Thermal diffusivity
Large eddy simulation
Parallel programming
Viscosity
Prandtl number
Richardson number
Turbulence models
Vortices
Vorticity
Drag coefficients
Roughness
Uniform flow
Methods
Reynolds number
Boundary conditions
Influence
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Resumen:This paper presents a roughness surface model for Lagrangian simulations that interacts with both temperature and vorticity fields. The chosen problem is the uniform flow around a rough circular cylinder heated with constant temperature under mixed convection. The methodology used is the Temperature Particles Method (TPM), in which both vorticity and temperature fields are discretized in particles to simulate the real flow in a purely Lagrangian form. The simulation is computationally extensive due to the application of the Biot–Savart law for the two fields and the calculation of buoyancy forces, which is alleviated by the use of parallel programming with OpenMP. The simulation of roughness effects for both fields is obtained using a Large Eddy Simulation (LES) model for vorticity, based on the second-order velocity structure function, which is correlated with the thermal diffusivity through the turbulent Prandtl number. In general, the results indicate that roughness increases the drag coefficient, while an increase in the Richardson number reduces this coefficient.
ISSN:2311-5521
DOI:10.3390/fluids10110288
Fuente:Materials Science Database