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    "114771-21833586":
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        "datetime_modified":"20240320T104159",
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        "event_title":"AIM Seminar:  Filtered volume fraction fluctuations in dilute, non-collisional, particle-laden flow",
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        "combined_title":"AIM Seminar:  Filtered volume fraction fluctuations in dilute, non-collisional, particle-laden flow: John Wakefield, Mechanical Engineering, University of Michigan",
        "event_subtitle":"John Wakefield, Mechanical Engineering, University of Michigan",
        "event_type":"Lecture \/ Discussion",
        "event_type_id":"13",
        "description":"Abstract:  Turbulent particle-laden flows give rise to spatial heterogeneity (e.g. clustering) characterized by two-point statistics.  Most coarse-grained (i.e. two fluid) models only solve for one-point moments, limiting reproduction of important two-phase flow statistics.  In this talk, we present set of equations describing the evolution of these flows that include fluctuating components of filtered fields --- a description of the level of clustering present in these flows.  For dilute heavy particles settling in homogeneous isotropic turbulence, the averaged filtered drag and filtered Reynolds-stress like term that dictates enhanced settling is correlated to this description of volume fraction fluctuation.  A data-driven approach that efficiently traverses parameter space in direct numerical simulations to inform closures is proposed, providing both descriptive insights and directions for future modeling.  Further, a numerical crossflow experiment is proposed, yielding several advantages over traditional forced homogeneous isotropic turbulence for the study of turbulent particle-laden flows.  The filtered volume fraction is shown to be valuable in that it may enable better fits for unclosed quantities related to particle drag and particle-phase momentum flux in coarse-grained simulations.\r\n\r\n\r\nContact:  Silas Alben",
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        "time_zone":"America\/Detroit",
        "event_title":"Belyi's theorem",
        "occurrence_title":"",
        "combined_title":"Belyi's theorem: Ritwick Bhargava",
        "event_subtitle":"Ritwick Bhargava",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Belyi\u2019s theorem states that a smooth projective complex algebraic curve (i.e. a compact Riemann surface) can be defined over a number field if and only if it can be expressed as a branched covering of the projective line ramified over at most 3 points, providing a purely topological characterization of an arithmetic condition. I will present a proof of this result and sketch how it leads to Grothendieck\u2019s theory of dessin d'enfants.",
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                "group_name":"Student Algebraic Geometry Seminar - Department of Mathematics",
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        "time_zone":"America\/Detroit",
        "event_title":"Combinatorics seminar -- Title TBA",
        "occurrence_title":"",
        "combined_title":"Combinatorics seminar -- Title TBA: Charles Wang, University of Michigan",
        "event_subtitle":"Charles Wang, University of Michigan",
        "event_type":"Workshop \/ Seminar",
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        "description":"TBA",
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        "datetime_modified":"20240225T210154",
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        "event_title":"HET Seminar | Recent developments in N=4 Yang-Mills Amplitudes",
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        "combined_title":"HET Seminar | Recent developments in N=4 Yang-Mills Amplitudes: Anastasia Volovich (Brown)",
        "event_subtitle":"Anastasia Volovich (Brown)",
        "event_type":"Lecture \/ Discussion",
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        "description":"The most important experimental probes of fundamental physics involve\r\nthe scattering of elementary particles. Over the years we have seen\r\nsignificant progress in understanding the properties of scattering\r\namplitudes and in our ability to carry out new computations both for\r\ntheoretical and phenomenological purposes. I will overview some recent\r\ndevelopments in N=4 Yang-Mills amplitudes.",
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