TY - JOUR

T1 - Finite-volume models with implicit subgrid-scale parameterization for the differentially heated rotating annulus

AU - Borchert, Sebastian

AU - Achatz, Ulrich

AU - Remmler, Sebastian

AU - Hickel, Stefan

AU - Harlander, Uwe

AU - Vincze, Miklos

AU - Alexandrov, Kiril D.

AU - Rieper, Felix

AU - Heppelmann, Tobias

AU - Dolaptchiev, Stamen I.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The differentially heated rotating annulus is a classical experiment for the investigation of baroclinic flows and can be regarded as a strongly simplified laboratory model of the atmosphere in mid-latitudes. Data of this experiment, measured at the BTU Cottbus-Senftenberg, are used to validate two numerical finite-volume models (INCA and cylFloit) which differ basically in their grid structure. Both models employ an implicit parameterization of the subgrid-scale turbulence by the Adaptive Local Deconvolution Method (ALDM). One part of the laboratory procedure, which is commonly neglected in simulations, is the annulus spin-up. During this phase the annulus is accelerated from a state of rest to a desired angular velocity. We use a simple modelling approach of the spin-up to investigate whether it increases the agreement between experiment and simulation. The model validation compares the azimuthal mode numbers of the baroclinic waves and does a principal component analysis of time series of the temperature field. The Eady model of baroclinic instability provides a guideline for the qualitative understanding of the observations.

AB - The differentially heated rotating annulus is a classical experiment for the investigation of baroclinic flows and can be regarded as a strongly simplified laboratory model of the atmosphere in mid-latitudes. Data of this experiment, measured at the BTU Cottbus-Senftenberg, are used to validate two numerical finite-volume models (INCA and cylFloit) which differ basically in their grid structure. Both models employ an implicit parameterization of the subgrid-scale turbulence by the Adaptive Local Deconvolution Method (ALDM). One part of the laboratory procedure, which is commonly neglected in simulations, is the annulus spin-up. During this phase the annulus is accelerated from a state of rest to a desired angular velocity. We use a simple modelling approach of the spin-up to investigate whether it increases the agreement between experiment and simulation. The model validation compares the azimuthal mode numbers of the baroclinic waves and does a principal component analysis of time series of the temperature field. The Eady model of baroclinic instability provides a guideline for the qualitative understanding of the observations.

KW - Baroclinic waves

KW - Differentially heated rotating annulus

KW - Finite-volume models

KW - Implicit subgrid-scale parameterization

KW - Principal component analysis

UR - http://www.scopus.com/inward/record.url?scp=84913608582&partnerID=8YFLogxK

U2 - 10.1127/metz/2014/0548

DO - 10.1127/metz/2014/0548

M3 - Article

AN - SCOPUS:84913608582

VL - 23

SP - 561

EP - 580

JO - Meteorologische Zeitschrift

JF - Meteorologische Zeitschrift

SN - 0941-2948

IS - 6

ER -