Sökning: WFRF:(Jansson Niclas 1983 ) >
Uncertainty Quantif...
Uncertainty Quantification of Reduced-Precision Time Series in Turbulent Channel Flow
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- Karp, Martin, 1996- (författare)
- KTH,Beräkningsvetenskap och beräkningsteknik (CST)
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- Liu, Felix (författare)
- KTH,Beräkningsvetenskap och beräkningsteknik (CST),Raysearch Laboratories.
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- Stanly, Ronith (författare)
- KTH,Strömningsmekanik och Teknisk Akustik
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- Rezaeiravesh, Saleh (författare)
- The University of Manchester, Manchester, United Kingdom
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- Jansson, Niclas, 1983- (författare)
- KTH,Beräkningsvetenskap och beräkningsteknik (CST),Parallelldatorcentrum, PDC
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- Schlatter, Philipp (författare)
- KTH,Strömningsmekanik och Teknisk Akustik,Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
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- Markidis, Stefano (författare)
- KTH,Beräkningsvetenskap och beräkningsteknik (CST)
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(creator_code:org_t)
- Association for Computing Machinery (ACM), 2023
- 2023
- Engelska.
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Ingår i: Proceedings of 2023 SC Workshops of the International Conference on High Performance Computing, Network, Storage, and Analysis, SC Workshops 2023. - : Association for Computing Machinery (ACM). ; , s. 387-390
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- With increased computational power through the use of arithmetic in low-precision, a relevant question is how lower precision affects simulation results, especially for chaotic systems where analytical round-off estimates are non-trivial to obtain. In this work, we consider how the uncertainty of the time series of a direct numerical simulation of turbulent channel flow at Ret = 180 is affected when restricted to a reduced-precision representation. We utilize a non-overlapping batch means estimator and find that the mean statistics can, in this case, be obtained with significantly fewer mantissa bits than conventional IEEE-754 double precision, but that the mean values are observed to be more sensitive in the middle of the channel than in the near-wall region. This indicates that using lower precision in the near-wall region, where the majority of the computational efforts are required, may benefit from low-precision floating point units found in upcoming computer hardware.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)