BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:A Preliminary Simulation of Convections and Airflows Using An Unst ructured Adaptive Mesh Finite-Element Model Fluidity-Atmosphere - Dr. Jinx i Li\, University of Cambridge DTSTART:20191111T140000Z DTEND:20191111T150000Z UID:TALK133873@talks.cam.ac.uk CONTACT:86947 DESCRIPTION:This study presents the development of an unstructured adaptiv e finite-element model (Fluidity-Atmosphere) for atmospheric research. Flu idity is a computational fluid-dynamics open source model capable of numer ically solving the 3D compressible Navier-Stokes equation using a dynamica lly adaptive mesh.\nTo evaluate the performance of adaptive meshes and clo ud microphysics parameterisation in Fluidity-Atmosphere\, the convection t est case has been setup and\nthe unstructured tetrahedral meshes are adapt ed automatically with the solutions of velocity and potential temperature in time and space. To couple the physical parameterisations with the 3D an isotropic unstructured mesh in Fluidity-Atmosphere\, a mesh-redistribution scheme has been designed. The simulation provides the structures of the d isturbance similar to the real convections\; realistic horizontal velocity fields having inflow concentrated near the surface and outflow in the upp er domain.\nTo improve the computational efficiency\, an “onom” Local- Galerkin method is designed which is a family of the variants of spectral element method\, employing nth-degree piecewise polynomials for the field representation while mth-degree polynomials for the flux representation. W e will introduce five onom schemes and analyze the dispersion relations an d the accuracy by homogeneous advection tests. The results have shown that the dispersion errors are smaller than the classical fourth-order finite difference schemes and the uniform nth-order accuracy is kept by onon sche me. LOCATION:Pfizer Lecture Theatre\, Department of Chemistry END:VEVENT END:VCALENDAR