Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient Analysis
The proposed research takes place in the framework of the analysis of the mechanical consequences of accidental scenarios for pressurized water reactors (PWR). It is particularly dedicated to the effects of the propagation of a transverse rarefaction wave through the assemblies of the nuclear core,...
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| Format: | Article |
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MDPI AG
2020-04-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/5/2/64 |
| _version_ | 1827717868487180288 |
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| author | Samy Mokhtari Guillaume Ricciardi Vincent Faucher Pierre Argoul Lucas Adélaide |
| author_facet | Samy Mokhtari Guillaume Ricciardi Vincent Faucher Pierre Argoul Lucas Adélaide |
| author_sort | Samy Mokhtari |
| collection | DOAJ |
| description | The proposed research takes place in the framework of the analysis of the mechanical consequences of accidental scenarios for pressurized water reactors (PWR). It is particularly dedicated to the effects of the propagation of a transverse rarefaction wave through the assemblies of the nuclear core, consecutive to a pipe break in the primary circuit of the reactor. This paper focuses on the representation, with a reduced number of well-chosen variables, of a pressure wave propagating through a highly congested medium composed of rod bundles, with the primary objective of accurately evaluating the resulting pressure forces exerted on the rods. To achieve this goal, a description of the fluid domain as a homogenized or porous medium is introduced, yielding the need for a new filtering technique to be applied to the fluid fields. A new homogenized and multiscale representation of the fluid variables, based on continuous wavelet transform (CWT), is thus proposed. The capabilities of CWT to accurately approximate a reference representative unsteady pressure field, corresponding to a wave propagation at microscale, is assessed. The proposed technique is applied to a pressure field obtained numerically at local scale. The number of variables that shall be kept at macroscale to have a meaningful representation of the pressure field is fully evaluated through the comparison of the fluid force applied to the microstructure. |
| first_indexed | 2024-03-10T20:10:29Z |
| format | Article |
| id | doaj.art-67ce62a7fdc54fc2987a1ca74b5709fb |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-03-10T20:10:29Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-67ce62a7fdc54fc2987a1ca74b5709fb2023-11-19T22:56:14ZengMDPI AGFluids2311-55212020-04-01526410.3390/fluids5020064Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient AnalysisSamy Mokhtari0Guillaume Ricciardi1Vincent Faucher2Pierre Argoul3Lucas Adélaide4CEA, DES, IRESNE, DTN, Cadarache, F-13108 Saint-Paul-Lez-Durance, FranceCEA, DES, IRESNE, DTN, Cadarache, F-13108 Saint-Paul-Lez-Durance, FranceCEA, DES, IRESNE, DTN, Cadarache, F-13108 Saint-Paul-Lez-Durance, FranceMAST-EMGCU, Univ. Gustave Eiffel, IFSTTAR, F-77454 Marne-la-Vallée, FranceMAST-EMGCU, Univ. Gustave Eiffel, IFSTTAR, F-77454 Marne-la-Vallée, FranceThe proposed research takes place in the framework of the analysis of the mechanical consequences of accidental scenarios for pressurized water reactors (PWR). It is particularly dedicated to the effects of the propagation of a transverse rarefaction wave through the assemblies of the nuclear core, consecutive to a pipe break in the primary circuit of the reactor. This paper focuses on the representation, with a reduced number of well-chosen variables, of a pressure wave propagating through a highly congested medium composed of rod bundles, with the primary objective of accurately evaluating the resulting pressure forces exerted on the rods. To achieve this goal, a description of the fluid domain as a homogenized or porous medium is introduced, yielding the need for a new filtering technique to be applied to the fluid fields. A new homogenized and multiscale representation of the fluid variables, based on continuous wavelet transform (CWT), is thus proposed. The capabilities of CWT to accurately approximate a reference representative unsteady pressure field, corresponding to a wave propagation at microscale, is assessed. The proposed technique is applied to a pressure field obtained numerically at local scale. The number of variables that shall be kept at macroscale to have a meaningful representation of the pressure field is fully evaluated through the comparison of the fluid force applied to the microstructure.https://www.mdpi.com/2311-5521/5/2/64compressible pressure wavescongested mediummultiscale filteringwaveletsPWR accidental transientEuler fluid equations |
| spellingShingle | Samy Mokhtari Guillaume Ricciardi Vincent Faucher Pierre Argoul Lucas Adélaide Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient Analysis Fluids compressible pressure waves congested medium multiscale filtering wavelets PWR accidental transient Euler fluid equations |
| title | Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient Analysis |
| title_full | Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient Analysis |
| title_fullStr | Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient Analysis |
| title_full_unstemmed | Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient Analysis |
| title_short | Multiscale Filtering of Compressible Wave Propagation in Complex Geometry through a Wavelet-Based Approach in the Framework of Pressurized Water Reactors Depressurization Transient Analysis |
| title_sort | multiscale filtering of compressible wave propagation in complex geometry through a wavelet based approach in the framework of pressurized water reactors depressurization transient analysis |
| topic | compressible pressure waves congested medium multiscale filtering wavelets PWR accidental transient Euler fluid equations |
| url | https://www.mdpi.com/2311-5521/5/2/64 |
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