Boundary conditions in flutter simulations of subsonic, transonic and supersonic blade cascades
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F24%3A00377184" target="_blank" >RIV/68407700:21220/24:00377184 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.jfluidstructs.2024.104189" target="_blank" >https://doi.org/10.1016/j.jfluidstructs.2024.104189</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jfluidstructs.2024.104189" target="_blank" >10.1016/j.jfluidstructs.2024.104189</a>
Alternative languages
Result language
angličtina
Original language name
Boundary conditions in flutter simulations of subsonic, transonic and supersonic blade cascades
Original language description
Simulations of blade flutter are highly sensitive to undesired wave reflections at inlet and outlet boundaries. A careful treatment of boundary conditions is required to prevent the generation of perturbations. This study is motivated by the need to perform flutter analysis of low-pressure steam turbine blades, for which supersonic inflow conditions may occur in the near-tip region. The exact steady non-reflecting boundary condition (NRBC), the spectral NRBC and a simple isentropic boundary condition are implemented in a time-marching flow solver and applied to turbomachinery flutter simulations covering a wide range of operating conditions. For the first time, the spectral NRBC is applied to a blade flutter simulation with a supersonic inlet and its performance is analysed and compared with other boundary condition formulations. It is shown that an effective non-reflective treatment in the design of the boundary condition is essential for an accurate aeroelastic prediction at all operating conditions, including the subsonic flow regime. The limitation of the exact steady NRBC to spatial modes causes it to perform poorly in some unsteady flow simulations, whereas the spectral NRBC achieves a satisfactory suppression of undesired wave reflections in all investigated cases.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20301 - Mechanical engineering
Result continuities
Project
<a href="/en/project/EF16_019%2F0000826" target="_blank" >EF16_019/0000826: Center of Advanced Aerospace Technology</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Fluids and Structures
ISSN
0889-9746
e-ISSN
1095-8622
Volume of the periodical
130
Issue of the periodical within the volume
09
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
21
Pages from-to
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UT code for WoS article
001320668600001
EID of the result in the Scopus database
2-s2.0-85204493310