On the efficient treatment of vertical mixing and chemistry in air pollution modeling

P.J.F. Berkvens; M. Deville; Mikhail A. Bochev; R. Owens; J.G. Verwer

On the efficient treatment of vertical mixing and chemistry in air pollution modeling

P.J.F. Berkvens, M. Deville (Editor), Mikhail A. Bochev, R. Owens (Editor), J.G. Verwer

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Abstract

Reaction-Advection-Diffusion problems occurring in Air Pollution Models have very stiff reaction terms and moderately stiff vertical mixing (diffusion and cloud transport) terms which both should be integrated implicitly in time. Standard implicit time stepping is by far too expensive for this type of problems whereas widely used splitting techniques may lead to unacceptably large errors for fast species. Recently proposed alternatives are the so-called source splitting and the ROS2 method combined with approximate matrix factorization (AMF). In this paper we compare these two methods with the standard Strang splitting method in a framework of an operational global dispersion model. The results of the tests favour the ROS2-AMF scheme.

Original language	Undefined
Number of pages	6
Publication status	Published - 2000
Event	16th IMACS World Congress - Lausanne, Switzerland Duration: 21 Aug 2000 → 25 Aug 2000

Conference

Conference	16th IMACS World Congress
Period	21/08/00 → 25/08/00
Other	August 21-25, 2000

Keywords

MSC-65M20
MSC-65Y20
MSC-65M06
EWI-8617
IR-66736

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Cite this

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title = "On the efficient treatment of vertical mixing and chemistry in air pollution modeling",

abstract = "Reaction-Advection-Diffusion problems occurring in Air Pollution Models have very stiff reaction terms and moderately stiff vertical mixing (diffusion and cloud transport) terms which both should be integrated implicitly in time. Standard implicit time stepping is by far too expensive for this type of problems whereas widely used splitting techniques may lead to unacceptably large errors for fast species. Recently proposed alternatives are the so-called source splitting and the ROS2 method combined with approximate matrix factorization (AMF). In this paper we compare these two methods with the standard Strang splitting method in a framework of an operational global dispersion model. The results of the tests favour the ROS2-AMF scheme.",

keywords = "MSC-65M20, MSC-65Y20, MSC-65M06, EWI-8617, IR-66736",

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T1 - On the efficient treatment of vertical mixing and chemistry in air pollution modeling

AU - Berkvens, P.J.F.

AU - Bochev, Mikhail A.

AU - Verwer, J.G.

A2 - Deville, M.

A2 - Owens, R.

N1 - Please note different possible spellings of the second author's name: "Botchev" or "Bochev"

PY - 2000

Y1 - 2000

N2 - Reaction-Advection-Diffusion problems occurring in Air Pollution Models have very stiff reaction terms and moderately stiff vertical mixing (diffusion and cloud transport) terms which both should be integrated implicitly in time. Standard implicit time stepping is by far too expensive for this type of problems whereas widely used splitting techniques may lead to unacceptably large errors for fast species. Recently proposed alternatives are the so-called source splitting and the ROS2 method combined with approximate matrix factorization (AMF). In this paper we compare these two methods with the standard Strang splitting method in a framework of an operational global dispersion model. The results of the tests favour the ROS2-AMF scheme.

AB - Reaction-Advection-Diffusion problems occurring in Air Pollution Models have very stiff reaction terms and moderately stiff vertical mixing (diffusion and cloud transport) terms which both should be integrated implicitly in time. Standard implicit time stepping is by far too expensive for this type of problems whereas widely used splitting techniques may lead to unacceptably large errors for fast species. Recently proposed alternatives are the so-called source splitting and the ROS2 method combined with approximate matrix factorization (AMF). In this paper we compare these two methods with the standard Strang splitting method in a framework of an operational global dispersion model. The results of the tests favour the ROS2-AMF scheme.

KW - MSC-65M20

KW - MSC-65Y20

KW - MSC-65M06

KW - EWI-8617

KW - IR-66736

M3 - Paper

T2 - 16th IMACS World Congress

Y2 - 21 August 2000 through 25 August 2000

ER -