Direct numerical simulations of turbulent channel flow under transcritical conditions

Peter C. Ma, Xiang Yang, Matthias Ihme

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Turbulent flows under transcritical conditions are present in regenerative cooling systems of rocker engines and extraction processes in chemical engineering. The turbulent flows and the corresponding heat transfer phenomena in these complex processes are still not well understood experimentally and numerically. The objective of this work is to investigate the turbulent flows under transcritical conditions using DNS of turbulent channel flows. A fully compressible solver is used in conjunction with a Peng-Robinson real-fluid equation of state to describe the transcritical flows. A channel flow with two isothermal walls is simulated with one heated and one cooled boundary layers. The grid resolution adopted in this study is slightly finer than that required for DNS of incompressible channel flows. The simulations are conducted using both fully (FC) and quasi-conservative (QC) schemes to assess their performance for transcritical wall-bounded flows. The instantaneous flows and the statistics are analyzed and compared with the canonical theories. It is found that results from both FC and QC schemes qualitatively agree well with noticeable difference near the top heated wall, where spurious oscillations in velocity can be observed. Using the DNS data, we then examine the usefulness of Townsend attached eddy hypothesis in the context of flows at transcritical conditions. It is shown that the streamwise energy spectrum exhibits the inverse wavenumber scaling and that the streamwise velocity structure function follows a logarithmic scaling, thus providing support to the attached eddy model at transcritical conditions.

    Original languageEnglish (US)
    Title of host publicationAIAA Aerospace Sciences Meeting
    PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
    Edition210059
    ISBN (Print)9781624105241
    DOIs
    StatePublished - Jan 1 2018
    EventAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
    Duration: Jan 8 2018Jan 12 2018

    Publication series

    NameAIAA Aerospace Sciences Meeting, 2018
    Number210059

    Other

    OtherAIAA Aerospace Sciences Meeting, 2018
    CountryUnited States
    CityKissimmee
    Period1/8/181/12/18

    Fingerprint

    Direct numerical simulation
    Channel flow
    Turbulent flow
    Wall flow
    Chemical engineering
    Cooling systems
    Equations of state
    Boundary layers
    Statistics
    Heat transfer
    Engines
    Fluids

    All Science Journal Classification (ASJC) codes

    • Aerospace Engineering

    Cite this

    Ma, P. C., Yang, X., & Ihme, M. (2018). Direct numerical simulations of turbulent channel flow under transcritical conditions. In AIAA Aerospace Sciences Meeting (210059 ed.). (AIAA Aerospace Sciences Meeting, 2018; No. 210059). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2018-0582
    Ma, Peter C. ; Yang, Xiang ; Ihme, Matthias. / Direct numerical simulations of turbulent channel flow under transcritical conditions. AIAA Aerospace Sciences Meeting. 210059. ed. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. (AIAA Aerospace Sciences Meeting, 2018; 210059).
    @inproceedings{0ca7608c91e643d7a8bb9e0676da0dcc,
    title = "Direct numerical simulations of turbulent channel flow under transcritical conditions",
    abstract = "Turbulent flows under transcritical conditions are present in regenerative cooling systems of rocker engines and extraction processes in chemical engineering. The turbulent flows and the corresponding heat transfer phenomena in these complex processes are still not well understood experimentally and numerically. The objective of this work is to investigate the turbulent flows under transcritical conditions using DNS of turbulent channel flows. A fully compressible solver is used in conjunction with a Peng-Robinson real-fluid equation of state to describe the transcritical flows. A channel flow with two isothermal walls is simulated with one heated and one cooled boundary layers. The grid resolution adopted in this study is slightly finer than that required for DNS of incompressible channel flows. The simulations are conducted using both fully (FC) and quasi-conservative (QC) schemes to assess their performance for transcritical wall-bounded flows. The instantaneous flows and the statistics are analyzed and compared with the canonical theories. It is found that results from both FC and QC schemes qualitatively agree well with noticeable difference near the top heated wall, where spurious oscillations in velocity can be observed. Using the DNS data, we then examine the usefulness of Townsend attached eddy hypothesis in the context of flows at transcritical conditions. It is shown that the streamwise energy spectrum exhibits the inverse wavenumber scaling and that the streamwise velocity structure function follows a logarithmic scaling, thus providing support to the attached eddy model at transcritical conditions.",
    author = "Ma, {Peter C.} and Xiang Yang and Matthias Ihme",
    year = "2018",
    month = "1",
    day = "1",
    doi = "10.2514/6.2018-0582",
    language = "English (US)",
    isbn = "9781624105241",
    series = "AIAA Aerospace Sciences Meeting, 2018",
    publisher = "American Institute of Aeronautics and Astronautics Inc, AIAA",
    number = "210059",
    booktitle = "AIAA Aerospace Sciences Meeting",
    edition = "210059",

    }

    Ma, PC, Yang, X & Ihme, M 2018, Direct numerical simulations of turbulent channel flow under transcritical conditions. in AIAA Aerospace Sciences Meeting. 210059 edn, AIAA Aerospace Sciences Meeting, 2018, no. 210059, American Institute of Aeronautics and Astronautics Inc, AIAA, AIAA Aerospace Sciences Meeting, 2018, Kissimmee, United States, 1/8/18. https://doi.org/10.2514/6.2018-0582

    Direct numerical simulations of turbulent channel flow under transcritical conditions. / Ma, Peter C.; Yang, Xiang; Ihme, Matthias.

    AIAA Aerospace Sciences Meeting. 210059. ed. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. (AIAA Aerospace Sciences Meeting, 2018; No. 210059).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    TY - GEN

    T1 - Direct numerical simulations of turbulent channel flow under transcritical conditions

    AU - Ma, Peter C.

    AU - Yang, Xiang

    AU - Ihme, Matthias

    PY - 2018/1/1

    Y1 - 2018/1/1

    N2 - Turbulent flows under transcritical conditions are present in regenerative cooling systems of rocker engines and extraction processes in chemical engineering. The turbulent flows and the corresponding heat transfer phenomena in these complex processes are still not well understood experimentally and numerically. The objective of this work is to investigate the turbulent flows under transcritical conditions using DNS of turbulent channel flows. A fully compressible solver is used in conjunction with a Peng-Robinson real-fluid equation of state to describe the transcritical flows. A channel flow with two isothermal walls is simulated with one heated and one cooled boundary layers. The grid resolution adopted in this study is slightly finer than that required for DNS of incompressible channel flows. The simulations are conducted using both fully (FC) and quasi-conservative (QC) schemes to assess their performance for transcritical wall-bounded flows. The instantaneous flows and the statistics are analyzed and compared with the canonical theories. It is found that results from both FC and QC schemes qualitatively agree well with noticeable difference near the top heated wall, where spurious oscillations in velocity can be observed. Using the DNS data, we then examine the usefulness of Townsend attached eddy hypothesis in the context of flows at transcritical conditions. It is shown that the streamwise energy spectrum exhibits the inverse wavenumber scaling and that the streamwise velocity structure function follows a logarithmic scaling, thus providing support to the attached eddy model at transcritical conditions.

    AB - Turbulent flows under transcritical conditions are present in regenerative cooling systems of rocker engines and extraction processes in chemical engineering. The turbulent flows and the corresponding heat transfer phenomena in these complex processes are still not well understood experimentally and numerically. The objective of this work is to investigate the turbulent flows under transcritical conditions using DNS of turbulent channel flows. A fully compressible solver is used in conjunction with a Peng-Robinson real-fluid equation of state to describe the transcritical flows. A channel flow with two isothermal walls is simulated with one heated and one cooled boundary layers. The grid resolution adopted in this study is slightly finer than that required for DNS of incompressible channel flows. The simulations are conducted using both fully (FC) and quasi-conservative (QC) schemes to assess their performance for transcritical wall-bounded flows. The instantaneous flows and the statistics are analyzed and compared with the canonical theories. It is found that results from both FC and QC schemes qualitatively agree well with noticeable difference near the top heated wall, where spurious oscillations in velocity can be observed. Using the DNS data, we then examine the usefulness of Townsend attached eddy hypothesis in the context of flows at transcritical conditions. It is shown that the streamwise energy spectrum exhibits the inverse wavenumber scaling and that the streamwise velocity structure function follows a logarithmic scaling, thus providing support to the attached eddy model at transcritical conditions.

    UR - http://www.scopus.com/inward/record.url?scp=85044382321&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85044382321&partnerID=8YFLogxK

    U2 - 10.2514/6.2018-0582

    DO - 10.2514/6.2018-0582

    M3 - Conference contribution

    SN - 9781624105241

    T3 - AIAA Aerospace Sciences Meeting, 2018

    BT - AIAA Aerospace Sciences Meeting

    PB - American Institute of Aeronautics and Astronautics Inc, AIAA

    ER -

    Ma PC, Yang X, Ihme M. Direct numerical simulations of turbulent channel flow under transcritical conditions. In AIAA Aerospace Sciences Meeting. 210059 ed. American Institute of Aeronautics and Astronautics Inc, AIAA. 2018. (AIAA Aerospace Sciences Meeting, 2018; 210059). https://doi.org/10.2514/6.2018-0582