Research output: Contribution to journal › Conference article › peer-review
Computing the aerodynamic drag of fractal aggregates in free-molecular and transition regimes. / Stoyanovskaya, Olga; Suslenkova, Anastasiya; Kusnatdinov, Timur.
In: Journal of Physics: Conference Series, Vol. 1640, No. 1, 012010, 14.10.2020.Research output: Contribution to journal › Conference article › peer-review
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TY - JOUR
T1 - Computing the aerodynamic drag of fractal aggregates in free-molecular and transition regimes
AU - Stoyanovskaya, Olga
AU - Suslenkova, Anastasiya
AU - Kusnatdinov, Timur
N1 - Publisher Copyright: © Published under licence by IOP Publishing Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/14
Y1 - 2020/10/14
N2 - For fine particles moving in the gas different regimes of aerodynamic drag are distinguished depending on their sizes and dust to gas relative velocities. In the Epstein or free-molecular regime, the drag force depends on the projected area or cross-section of the body, and in the Stokes or transition regime, on its linear size. Finding the linear size and the projected area for nonspherical particles is a non-trivial task. To describe the mobility of some type of nonspherical particles - fluffy aggregates, considered as a set of spheres - monomers, the value Df called fractal dimension is often used. For such aggregates with fixed fractal dimension D0, several authors suggested the approximations of the linear size (called Smoluchowski radius Rs) and projected area PA as a function of N - the number of monomers in the aggregate. These authors validated their approximations on experimental data. On the other hand, new direct numerical simulation (DNS) data on mobility of fractal aggregates have been obtained recently. In the paper we constructed new functions PA(Df,N) and Rs(Df, N) interpolating available from the literature approximations of PA(Df = D0,N) and Rs(Df = D0,N) and minimizing the deviation from recent DNS data. These functions are designed for global simulations of protoplanetary discs dynamics and planet formation, but can be used in different applications.
AB - For fine particles moving in the gas different regimes of aerodynamic drag are distinguished depending on their sizes and dust to gas relative velocities. In the Epstein or free-molecular regime, the drag force depends on the projected area or cross-section of the body, and in the Stokes or transition regime, on its linear size. Finding the linear size and the projected area for nonspherical particles is a non-trivial task. To describe the mobility of some type of nonspherical particles - fluffy aggregates, considered as a set of spheres - monomers, the value Df called fractal dimension is often used. For such aggregates with fixed fractal dimension D0, several authors suggested the approximations of the linear size (called Smoluchowski radius Rs) and projected area PA as a function of N - the number of monomers in the aggregate. These authors validated their approximations on experimental data. On the other hand, new direct numerical simulation (DNS) data on mobility of fractal aggregates have been obtained recently. In the paper we constructed new functions PA(Df,N) and Rs(Df, N) interpolating available from the literature approximations of PA(Df = D0,N) and Rs(Df = D0,N) and minimizing the deviation from recent DNS data. These functions are designed for global simulations of protoplanetary discs dynamics and planet formation, but can be used in different applications.
UR - http://www.scopus.com/inward/record.url?scp=85096364158&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1640/1/012010
DO - 10.1088/1742-6596/1640/1/012010
M3 - Conference article
AN - SCOPUS:85096364158
VL - 1640
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012010
T2 - 3rd Virtual Workshop on Numerical Modeling in MHD and Plasma Physics, MHD-PP 2020
Y2 - 12 October 2020 through 16 October 2020
ER -
ID: 26028921