Isbn: 9783836488921 - numerical models of the early stages of planet formation: a new perspective on the role of turbulence (6 résultats)

Etat : New. pp. 216.

Taschenbuch. Etat : Neu. Numerical Models of the Early Stages of Planet Formation | A New Perspective on the Role of Turbulence | Anders Johansen | Taschenbuch | Englisch | VDM Verlag Dr. Müller | EAN 9783836488921 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu. …

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Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - In the earliest stages of planet formation micrometer-sized dust grains collide and gradually build up kilometer-sized {em planetesimals}, bodies that are so large that they can attract each other directly by gravity. This is an important landmark on the way to real planets because of the change to gravity-dominated growth. The road from boulders to planetesimals is however poorly known. Boulders have poor sticking properties and spiral into the young star due to the head wind from the slower rotating gas. This work presents the first detailed computer simulations of the motion of dust and boulders in turbulent protoplanetary discs. The turbulent diffusion coefficient of small dust grains is measured to be surprisingly high, whereas larger boulders concentrate by up to two orders of magnitude in transient high pressure regions that arise spontaneously in magnetorotational turbulence. The coupled motion of boulders and gas is found to be linearly unstable to the so-called streaming instability, leading to a turbulent state that is characterised by dense clumps of boulders that shield each other against the head wind of the gas.; In the earliest stages of planet formation micrometer-sized dust grains collide and gradually build up kilometer-sized {\\em planetesimals}, bodiesthat are so large that they can attract each other directly by gravity. This is an important landmark on the way to real planets because of the change togravity-dominated growth.The road from boulders to planetesimals is however poorly known. Boulders have poor sticking properties and spiral into the young star due to the head wind from the slower rotating gas.This work presents the first detailed computer simulations of the motion of dust and boulders in turbulent protoplanetary discs. The turbulent diffusion coefficient of small dust grains is measured to be surprisingly high, whereas larger boulders concentrate by up to two orders of magnitude in transient high pressure regions that arise spontaneously in magnetorotational turbulence. The coupled motion of boulders and gas is found to be linearly unstable to the so-called streaming instability, leading to a turbulent state that is characterised by dense clumps of boulders that shield each other against the head wind of the gas.…

Etat : New. Print on Demand pp. 216 23:B&W 6 x 9 in or 229 x 152 mm Perfect Bound on White w/Gloss Lam.

Etat : New. PRINT ON DEMAND pp. 216.