Aeroacoustic simulations in thermally non-homogeneous fluid flows

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985840%3A_____%2F25%3A00637095" target="_blank" >RIV/67985840:_____/25:00637095 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21220/25:00381157

Výsledek na webu

<a href="http://dx.doi.org/10.14311/TPFM.2025.005" target="_blank" >http://dx.doi.org/10.14311/TPFM.2025.005</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/TPFM.2025.005" target="_blank" >10.14311/TPFM.2025.005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Aeroacoustic simulations in thermally non-homogeneous fluid flows

Popis výsledku v původním jazyce

The cooling system, comprising heat exchangers and cooling fans, is essential for maintaining the power performance and acceptable operational conditions of a vehicle. However, running of the cooling fan produces unwanted noise, which often becomes dominant sound produced by the vehicle. To model the noise generated by turbulent flow and heat transfer around cooling fan blades, an appropriate flow model is essential. This study employs the compressible Navier-Stokes equations with an restricted relation between temperature and density for efficient handling of non-homogeneous temperature fields, combined with Delayed Detached Eddy Simulation (DDES) for advanced turbulence modeling. For the aeroacoustic analysis, a hybrid aeroacoustic approach is adopted, utilizing the Acoustic Perturbation Equation (APE) to model acoustic generation and propagation. The main aim of this study is to model the flow and the acoustic problem in the consistent way for the considered simple test case of heated cylinder walls in cross-flow. As most prior investigations focused only on isothermal conditions the model considered in this study presents an important generalization. A part of the problem is to select an efficient numerical software capable to treat temperature non-homogeneities in the flow and the aeroacoustic solver while being prepared for a possible future industrial application. The obtained results for varying thermal conditions show the significant sensitivity of produced sound pressure levels.

Název v anglickém jazyce

Aeroacoustic simulations in thermally non-homogeneous fluid flows

Popis výsledku anglicky

The cooling system, comprising heat exchangers and cooling fans, is essential for maintaining the power performance and acceptable operational conditions of a vehicle. However, running of the cooling fan produces unwanted noise, which often becomes dominant sound produced by the vehicle. To model the noise generated by turbulent flow and heat transfer around cooling fan blades, an appropriate flow model is essential. This study employs the compressible Navier-Stokes equations with an restricted relation between temperature and density for efficient handling of non-homogeneous temperature fields, combined with Delayed Detached Eddy Simulation (DDES) for advanced turbulence modeling. For the aeroacoustic analysis, a hybrid aeroacoustic approach is adopted, utilizing the Acoustic Perturbation Equation (APE) to model acoustic generation and propagation. The main aim of this study is to model the flow and the acoustic problem in the consistent way for the considered simple test case of heated cylinder walls in cross-flow. As most prior investigations focused only on isothermal conditions the model considered in this study presents an important generalization. A part of the problem is to select an efficient numerical software capable to treat temperature non-homogeneities in the flow and the aeroacoustic solver while being prepared for a possible future industrial application. The obtained results for varying thermal conditions show the significant sensitivity of produced sound pressure levels.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10101 - Pure mathematics

Projekt

<a href="/cs/project/GA22-01591S" target="_blank" >GA22-01591S: Matematická teorie a numerická analýza rovnic vazkých newtonovských stlačitelných tekutin</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Topical Problems of Fluid Mechanics 2025

ISBN

978-80-87012-05-5

ISSN

2336-5781

e-ISSN

—

Počet stran výsledku

8

Strana od-do

31-38

Název nakladatele

Ústav termomechaniky AV ČR v. v. i.

Místo vydání

Prague

Místo konání akce

Praha

Datum konání akce

12. 2. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001597458700005