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Effect of the turbulence model on the heat ventilation analysis in a box prototype

Benguesmia Hani, Bakri Badis, Driss Zied, Ketata Ahmed, Driss Slah

Diagnostyka

2020

Vol. 21, No. 3

55--66

Investigations of the flow in a building system are crucial for understanding the fundamental basis of the aerodynamic structure characteristics. The CFD simulations were conducted using ANSYS Fluent 17.0 software, which solves the Navier-Stokes equations in conjunction with different turbulence models and by a finite volume discretization method. Particularly, a comparison between the experimental and standard k-ω, BSL k-ω, SST k-ω, standard k-ɛ, RNG k-ɛ and Realizable k-ɛ turbulence model has been developed. The comparison between the founded results affirms that the standard k-ω turbulence model is the most efficient to model the air flow in the present application. Indeed, the numerical results compared using the experimental data developed in the LASEM laboratory confirms the validity of the numerical method. The good agreements validate the considered computational method.

Chaos in solar system

Kratochvil C., Sveda P.

Modelling and Optimization of Physical Systems

2010

z. 9

55--60

At first sight, it appears that the Solar System is an example of simplicity and order. The Sun and planets can be replaced by concentrated masses, distances among objects are great, and the masses of planets are very small comparing with the Sun. At the present time the development of astronomy, physics and mechanics, confirms that the reverse is true. The Solar System is a chaotic system with all attendant signs and symptoms, but on a galactic time scale. The following paper presents and describes some examples of chaotic events in the Solar System.

Na prvý pohled se zdá, že Slunečni soustava je přikladem jednoduchosti a pořádku. Slunce i planety lze nahradit soustředěnými hmotnostmi, vzdálenost jednotlivých těles jsou veliké, hmotnosti jednotlivých planet vzhledem ke Slunci jsou velmi malé. Ukázalo se a rozvoj astronomie, fyziky a mechaniky v současné době to potvrzuje, že opak je pravdou a Slunečni soustava je soustavou chaotickou se všemi průvodnimi znaky a projevy, ovšem v galaktickém časovém měřítku. S některými projevy chaosu ve Sluneční soustavě si dovolíme čtenáře v článku seznámit.