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CATEGORIES:Centre for Atmospheric Science seminars\, Chemistr
y Dept.
SUMMARY:A Preliminary Simulation of Convections and Airflo
ws Using An Unstructured Adaptive Mesh Finite-Elem
ent Model Fluidity-Atmosphere - Dr. Jinxi Li\, Uni
versity of Cambridge
DTSTART;TZID=Europe/London:20191111T140000
DTEND;TZID=Europe/London:20191111T150000
UID:TALK133873AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/133873
DESCRIPTION:This study presents the development of an unstruct
ured adaptive finite-element model (Fluidity-Atmos
phere) for atmospheric research. Fluidity is a com
putational fluid-dynamics open source model capabl
e of numerically solving the 3D compressible Navie
r-Stokes equation using a dynamically adaptive mes
h.\nTo evaluate the performance of adaptive meshes
and cloud microphysics parameterisation in Fluidi
ty-Atmosphere\, the convection test case has been
setup and\nthe unstructured tetrahedral meshes are
adapted automatically with the solutions of veloc
ity and potential temperature in time and space. T
o couple the physical parameterisations with the 3
D anisotropic unstructured mesh in Fluidity-Atmosp
here\, a mesh-redistribution scheme has been desig
ned. The simulation provides the structures of the
disturbance similar to the real convections\; rea
listic horizontal velocity fields having inflow co
ncentrated near the surface and outflow in the upp
er domain.\nTo improve the computational efficienc
y\, an “onom” Local-Galerkin method is designed wh
ich is a family of the variants of spectral elemen
t method\, employing nth-degree piecewise polynomi
als for the field representation while mth-degree
polynomials for the flux representation. We will i
ntroduce five onom schemes and analyze the dispers
ion relations and the accuracy by homogeneous adve
ction tests. The results have shown that the dispe
rsion errors are smaller than the classical fourth
-order finite difference schemes and the uniform n
th-order accuracy is kept by onon scheme.
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
CONTACT:
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