Detailed airflow dynamics and temperature data of axisymmetric and anisothermal jets developing in a room

Gresse, Teddy; Merlier, Lucie; Kuznik, Frédéric

doi:10.1016/j.dib.2020.105382

Cited by 5 publications

(6 citation statements)

References 2 publications

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“…Detailed measurements of isothermal and non-isothermal jet flows in a thermally controlled room were presented by Gresse et al [88]. The scenario of cold air supply is used in this study for validation and sensitivity analyses.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental boundary conditions are shown in Table 2 for the scenario of cold air supply. The supply inlet velocity was 1.47 m/s (U 0 ), and the supply inlet temperature (T 0 ) was 12.7 • C. The corresponding inlet Archimedes number was 0.014, and the inlet Reynolds number (based on nozzle diameter) was 11,760 [88], which implies the supply airflow was in a fully turbulent regime. However, the airflow in a room space involves a combination of different flow regimes [2,76].…”

Section: Methodsmentioning

confidence: 99%

“…Symbols Y c and Z c denote the center of inlet opening. Detailed measurement information can be found from Gresse et al [88]. and prescribed values of air temperature are imposed as the inlet air temperature boundary conditions.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…If detailed inlet conditions are absent, the validation studies can be hindered, and a biased conclusion on the performance of turbulence models and other computational settings might be reached. In 2020, Gresse et al [88] published measurement data of indoor airflow from a round nozzle diffuser with three-dimensional mean velocity components, air temperature, and Reynolds stress tensor components with high resolution. Since the measurement includes detailed information near the inlet opening, it enables evaluating inlet boundary conditions in an accurate way, including detailed boundary conditions of Reynolds stress components for RSM modeling.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of inlet boundary conditions on 3D steady RANS simulations of non-isothermal mechanical ventilation in a generic closure

Kang

Hooff

2022

International Journal of Thermal Sciences

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of inlet boundary conditions on 3D steady RANS simulations of non-isothermal mechanical ventilation in a generic closure

Kang

Hooff

2022

International Journal of Thermal Sciences

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“…Ryfa et al 15 evaluated the influence of the geometrical and flow parameters on the heat transfer coefficient of the jets. In addition, Gresse et al 16 tested the air temperature, velocity and turbulence quantities of axisymmetric and anisothermal air jets at different planes, which is useful for verifying the accuracy of the above numerical model.…”

Section: Introductionmentioning

confidence: 99%

Impacts of low atmospheric pressure on distribution of indoor hot air jet in plateau area

Wang

et al. 2022

Indoor and Built Environment

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The existing design parameters of hot-air heating for local buildings do not consider the distinctive low-pressure that can be experienced in the plateau regions, resulting in significant inefficiency. In this study, a numerical model based on the Reynolds time-averaged method coupled with the RNG k–ε turbulence model was established by considering the air thermal properties influenced by pressure. Four atmospheric conditions of 101.325 kPa, 84.547 kPa, 70.093 kPa and 57.708 kPa were selected to simulate the velocity and temperature fields of the horizontal and vertical hot-air jets. The influence of low pressure on the flow characteristics of hot-air jets was analyzed subsequently. The results suggest the jet flow patterns are essentially similar under various pressures. The horizontal hot-air jets bent upward more significantly and the diffusion range of the vertical jets was reduced under low pressure. The jet velocity decayed faster at low pressure, and the axial velocity of a vertical jet at 57.708 kPa was 0.26 m/s lower than that at 101.325 kPa. The temperature gradient of the room with a hot-air jet was increased with decreasing pressure, which was 5.0 K/m at 57.708 kPa. This study should be helpful to the detailed design and efficient operation of hot-air heating in buildings in the plateau regions.

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A time‐staggered second order conservative time scheme for variable density flow

Amino

Flageul

Benhamadouche

et al. 2022

Numerical Methods in Fluids

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In this study, we present a robust conservative time-staggered scheme for variable density flow. This pressure correction scheme uses the compressible Navier-Stokes equations and is implemented in the collocated finite-volume open-source computational fluid dynamics solver code_saturne. The Helmholtz equation is solved for the pressure increment, taking the thermodynamic pressure into account and avoiding the acoustic time step limitation. The internal energy equation is used and completed by a source term derived from the discrete kinetic energy equation, thus enforcing total energy conservation and consistency for irregular solutions. A numerical analysis providing conditions ensuring the positivity of the thermodynamic variables is proposed. The scheme is verified and validated against analytical and experimental test cases. Its ability to reproduce the pressure variation while conserving the mass is demonstrated. Its conservative property and time convergence order are also verified. An irregular shock solution is studied, emphasizing the importance of the source term in the internal energy equation. Finally, the scheme is validated against reference numerical results on a two-dimensional natural convection cavity and experimental data on a three-dimensional ventilation test case. The comparison against experimental data is made using first-and second-order turbulent simulations.

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Detailed airflow dynamics and temperature data of axisymmetric and anisothermal jets developing in a room

Cited by 5 publications

References 2 publications

Influence of inlet boundary conditions on 3D steady RANS simulations of non-isothermal mechanical ventilation in a generic closure

Influence of inlet boundary conditions on 3D steady RANS simulations of non-isothermal mechanical ventilation in a generic closure

Impacts of low atmospheric pressure on distribution of indoor hot air jet in plateau area

A time‐staggered second order conservative time scheme for variable density flow

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