154th meeting of the seminar
«Mathematical modeling of geophysical processes: direct and inverse problems»
The seminar is devoted to the consideration of various aspects of mathematical modeling of physical processes in the atmosphere, hydrosphere and active layer of land, associated with solving problems arising in the study of the problems of climate change and the natural environment.
Seminar Organizing Committee
Doctor of Physics and Mathematics A.V. Glazunov (Marchuk Institute of Numerical Mathematics of RAS)
Doctor of Physics and Mathematics I.A. Repina (A.M. Obukhov Institute of Atmospheric Physics of RA)
Doctor of Physics and Mathematics V.M. Stepanenko (RCC MSU, Geographical Faculty of Moscow State University)
A.V. Debolsky (RCC MSU, A.M. Obukhov Institute of Atmospheric Physics of RAS).
|A.V. Glazunov||Marchuk Institute of Numerical Mathematics of RAS, RCC MSU|
|E.V. Mortikov||RCC MSU, Marchuk Institute of Numerical Mathematics of RAS|
|A.V. Debolsky||RCC MSU, A.M. Obukhov Institute of Atmospheric Physics of RAS|
MEMORIES ABOUT NUMERICAL SIMULATION OF STRATIFIED TURBULENCE OVER URBAN-TYPE SURFACES.
The results of LES calculations of steady-state neutral and stably stratified turbulent flows over urban-type surfaces are presented. Numerical experiments were carried out for various configurations of streamlined objects and for different static stability. A new algorithm for performing calculations with three-dimensional non-stationary models of stratified turbulence over surfaces of complex shape is proposed and tested, designed to obtain an equilibrium state with given values of the determining parameters. Peculiarities of thermal and dynamic interaction of turbulent flow over objects with the surface as a whole are revealed. A strong dependence of the thermal roughness parameter on stratification has been found. A physical mechanism is discussed that makes it possible to maintain turbulence over surfaces with large roughness elements with strong stability.
A new parametrization of the turbulent length scale for a multilayer RANS model of an urban environment is proposed, which does not contain the geometric parameters of streamlined objects. The parametrization is included in the local-one-dimensional model of the urban boundary layer and tested on the data of eddy-resolving modeling
The prospects for the development of the presented areas of research in the context of import substitution are briefly discussed.
The seminar will be held in the form of a webinar on the Zoom platform.
Topic: семинар "Математическое моделирование геофизических процессов: прямые и обратные задачи".
Time: April 21, 2022 05:15 PM Moscow (GMT+3)
Join Zoom Meeting: https://us02web.zoom.us/j/84581028236?pwd=R1N3R1FMUjRJYWt3b3dhTlVYbzlSdz09
Meeting ID: 845 8102 8236
Video recordings of the seminar are available on our youtube channel.
For communication on all issues related to the work of the seminar, please contact the academic secretary Andrey Vladimirovich Debolsky at firstname.lastname@example.org