Cristin-resultat-ID: 1766778
Sist endret: 6. mars 2020, 10:39
Resultat
Doktorgradsavhandling
2019

Shock-induced flow through particle clouds

Bidragsytere:
  • Andreas Nygård Osnes

Utgiver/serie

Utgiver

Universitetet i Oslo
NVI-nivå 0

Om resultatet

Doktorgradsavhandling
Publiseringsår: 2019
Antall sider: 137

Klassifisering

Fagfelt (NPI)

Fagfelt: Fysikk
- Fagområde: Realfag og teknologi

Beskrivelse Beskrivelse

Tittel

Shock-induced flow through particle clouds

Sammendrag

High-speed flows through dense particle clouds occur in many technological applications such as explosion mitigation systems, combustion engines, drug-delivery systems, as well as natural phenomena such as volcanic eruptions and meteoroid breakup. This thesis studies such flows by means of numerical simulations. Typical flows of interest feature trillions of particles, and it is therefore necessary to use simplified models to describe the behaviour of the particles and the flow around them. In this thesis, we use very large, accurate, simulations to study the details of shock-induced flows with a moderate number of particles. In addition, full-scale simulations with a large number of particles are used to determine the sensitivity of such simulations to modelling choices. The simulations with few particles show that high particle concentration necessitates modifications to the drag-laws and flow model approximations that are used to simulate full-scale problems. Small-scale flow fluctuations affect the average flow statistics, and must be modelled in simulations where they are not directly captured. The full-scale simulations show that the shock-accelerated particles self-organise and form particle jets, in agreement with experiments. To capture this process, the simulations must account for the interchange of momentum and energy between the particles and the surrounding air.

Bidragsytere

Andreas Nygård Osnes

  • Tilknyttet:
    Forfatter
    ved Autonomi og sensorteknologier ved Universitetet i Oslo

Magnus Vartdal

  • Tilknyttet:
    Veileder
    ved Totalforsvar ved Forsvarets forskningsinstitutt

Bjørn Anders Pettersson Reif

  • Tilknyttet:
    Veileder
    ved Seksjon for energisystemer ved Universitetet i Oslo

Marianne Gjestvold Omang

  • Tilknyttet:
    Veileder
    ved Institutt for teoretisk astrofysikk ved Universitetet i Oslo
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