Air distribution measurement in a room with a sidewall jet: A 3D benchmark test for CFD validation

Hurnik, Maria; Błaszczok, Monika; Popiołek, Zbigniew

doi:10.1016/j.buildenv.2015.07.004

Cited by 29 publications

(21 citation statements)

References 31 publications

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“…It has been done already in [10,11] where a theoreticallydeveloped procedure of Vm processing has been examined using both the LES and the cabin ventilation qualification test data for the ISS pressurized module Columbus. The accuracy of the velocity-to-speed conversion procedures developed for the RANS data processing was evaluated in [16,17] where LES data on mixing ventilation in a test isothermal room with a sidewall jet were compared with the experimental data [18], namely, the LDA measurement data in the highvelocity jet zone and omnidirectional low velocity thermal anemometer data in the occupied zone.…”

Section: Cabin Air Velocity Distributionmentioning

confidence: 99%

CFD Evaluation of Directional Variation Effects of the Air Supply Diffuser for the International Space Station Cabin Atmosphere

et al. 2019

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The International Space Station (ISS) crew health and safety depend on ventilation system performance. The ISS ventilation system comprises of numerous air supply diffusers. For each ISS module design of the ventilation system and, in particular, supply diffuser distribution and configuration, is based on the assumption that the cabin aisle way is clear of any objects. However, on-orbit operations could lead to short- or long-term blockage of the area near the air supply diffuser due to some items or stowed bags necessary for the station operation. Partial blockage of the diffuser could disrupt the free jet airflow or change its intended direction. The current contribution is devoted to examination of the ISS research module – the U.S. Laboratory – ventilation system performance in case of partial inlet diffuser blockage with objects, such as Cargo Transfer Bag. The goal of the study is to assess the localized effects when the blockage occurs in the module interior for a possible stagnant zones formation. The paper presents detailed analysis of the diffuser blockage effects on airflow characteristics in various zones in the ISS habitat.

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Section: Cabin Air Velocity Distributionmentioning

confidence: 99%

CFD Evaluation of Directional Variation Effects of the Air Supply Diffuser for the International Space Station Cabin Atmosphere

et al. 2019

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“…To validate the CFD results, it is necessary to compare the numerical data with the experimental benchmark data. Extended description of most representative mixing ventilation benchmark experiments with the correspondent reference list is given in [16]. Examples of well-documented experimental data are as follows.…”

Section: Introductionmentioning

confidence: 99%

“…In mixing ventilation systems diffusers are often located at side walls, above the inhabitants, and it is necessary to predict correctly not only the jet behavior, but the interaction between the jet zone, characterized by high velocities, and the low-velocity zone of induced secondary flows (occupied zone). Recent experiments by Hurnik et al in 2015 [16,27] are the only example of a 3D test for a room with a sidewall jet with pronounced division into the jet and occupied zones. 3D jet supplied from a rectangular sidewall diffuser was studied using the LDA measurements (two air velocity components were measured with the uncertainty lower than 5%), while velocity fields in the occupied zone were measured with the omnidirectional low velocity thermal anemometers (LVTA) techniques.…”

Section: Introductionmentioning

confidence: 99%

Unsteady RANS Simulation of Air Distribution in a Ventilated Classroom with Numerous Jets

et al. 2019

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The study is devoted to the Unsteady Reynolds-Averaged Navies-Stokes (URANS) simulation of ventilation in an isothermal room with numerous jets supplied from ceiling diffusers. The computations of the airflow under the test conditions considered were carried out in the classroom of the Technical University of Sofia with no occupants. The room floor has a simple rectangular form, but several columns, beams, window sills, and four radiators are located inside the room that makes the geometry more complex. Air is supplied to the room through four ceiling fan coils, the Reynolds number is 2×104. Calculations were carried out using the ANSYS Fluent 18.2 software with the standard k-ε turbulence model chosen. Computational meshes of up to 33 million hexahedral cells clustered to the inlet and outlet sections were used. The main aim of the study presented is to analyze and discuss the complicated 3D flow structure in the room and to give foundation for future measurements of air velocity field in the room.

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“…Recent contributions [11,12] presented wallmodeled LES (WMLES) data on mixing ventilation in a test isothermal room with a sidewall jet for which welldocumented measurement data by Hurnik et al are available [13,14]. The computational data demonstrated the level of the difference between Vm and Va values both in the jet zone with relatively high velocity values [11] and in the low-velocity occupied zone [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of mean velocity and mean speed for test ventilated room from RANS and LES CFD modeling

et al. 2019

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The paper presents and discusses data for the ventilation airflow in an isothermal room corresponding to the Nielsen et al. (1978) test computed with Large Eddy Simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) approaches. As LES computations provide directly both the speed and velocity components data, the difference between the mean speed and mean velocity values is computed and discussed. For the RANS computations that give the mean velocity data only, application of the velocity-to-speed conversion procedure based on the turbulence kinetic energy field provided by a turbulence model resulted in accurate mean speed evaluation.

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Air distribution measurement in a room with a sidewall jet: A 3D benchmark test for CFD validation

Cited by 29 publications

References 31 publications

CFD Evaluation of Directional Variation Effects of the Air Supply Diffuser for the International Space Station Cabin Atmosphere

CFD Evaluation of Directional Variation Effects of the Air Supply Diffuser for the International Space Station Cabin Atmosphere

Unsteady RANS Simulation of Air Distribution in a Ventilated Classroom with Numerous Jets

Evaluation of mean velocity and mean speed for test ventilated room from RANS and LES CFD modeling

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