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Turbulence Characterization of High Tumble In Cylinder Flow Using 3D CFD Simulations

Patel, Taral R
http://orcid.org/0009-0007-0835-4451
http://rave.ohiolink.edu/etdc/view?acc_num=osu1682011166323006

Abstract Details

2023, Master of Science, Ohio State University, Mechanical Engineering.
This project's purpose was to develop and validate the methodologies that can be used as a baseline for turbulence characterization of the in– cylinder engine flow. In – cylinder flow is a complex combination of swirl and tumble, but since it is dominated by tumble, the flow initialization used in this project was of pure tumble in nature. In the end, the results yielded the effect of factors such as grid size, turbulence model, simulation time step, CFL number and analysis techniques on determining time constants for decay equations and integral length scale. Results from the grid convergence study concluded that for specific case in this project 0.5mm grid is the most appropriate grid for flow modelling. In addition to that, it was observed that a 0.5mm mesh can resolve 80 – 90% of the essential scales that were present in the domain during the decay period of the simulation cycle. Study of the turbulence model gave an insight on the robust modelling capabilities of the Realizable K – Epsilon turbulence model to calculate the Turbulent Kinetic Energy growth and decay in the flow domain. Consequently, the gap of scale resolving inability of RANS turbulence models such as Realizable K – Epsilon was filled by WALE sub grid LES model. The detail eddy representation of LES model aided in choosing this turbulence model for determination of Integral Length Scale. Finally, multiple geometries of the stationary cylinder with pent – roof head is analyzed to investigate the relation of TKE decay time constant with piston position. A decreasing trend in the time constant with the piston position is observed for multiple geometries which can be used to extrapolate the time constants for piston position that have not been simulated explicitly. Some benefits of this research are the development of the base methodologies that can not only be used in turbulence flow characterization for stationary in – cylinder flow but for motored and firing conditions as well.
Zhenyu Wang (Committee Member)
Clarissa Belloni (Committee Member)
96 p.
Mechanical Engineering
Turbulence Characterization, Tumble flow, In cylinder flow, 3D CFD engine simulation, StarCCM, Integral Length Scale

Recommended Citations

Citations

  • Patel, T. R. (2023). Turbulence Characterization of High Tumble In Cylinder Flow Using 3D CFD Simulations [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1682011166323006

    APA Style (7th edition)

  • Patel, Taral. Turbulence Characterization of High Tumble In Cylinder Flow Using 3D CFD Simulations. 2023. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1682011166323006.

    MLA Style (8th edition)

  • Patel, Taral. "Turbulence Characterization of High Tumble In Cylinder Flow Using 3D CFD Simulations." Master's thesis, Ohio State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=osu1682011166323006

    Chicago Manual of Style (17th edition)

osu1682011166323006
82
© 2023, some rights reserved.Creative Commons License Turbulence Characterization of High Tumble In Cylinder Flow Using 3D CFD Simulations by Taral R Patel is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.
Release 3.2.12