Blar i Institutt for energi og prosessteknikk på tittel
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Numerical studies of particle clustering in circular cylinder wake flows
(Doctoral theses at NTNU;2022:51, Doctoral thesis, 2022)The emphasis of this thesis is to investigate how inertial point particles are clustered and dispersed in the wake of a circular cylinder with an uniform free stream. The numerical simulations that directly solved Navier-Stokes ... -
Numerical study of a Francis turbine over wide operating range: Some practical aspects of verification
(Peer reviewed; Journal article, 2020)Hydropower plays an essential role in maintaining energy flexibility. Modern designs focus on sustainability and robustness using different numerical tools. Automatic optimization of the turbines is widely used, including ... -
Numerical study of curved-mesh tailoring of free-surface shear profile
(Master thesis, 2019)Krummede nettinger blir ofte brukt til å endre hastighetsprofilet i testområdet i eksperimentelle anlegg. De eksisterende uttrykkene som kan brukes til å bestemme formen på nettingen, gitt strømningsforholdene opp- og ... -
Numerical study of flow calming structures in hydropower plants
(Master thesis, 2021)For å forlenge livsløpet til hydrauliske turbiner er det nødvendig å minimere skader forårsaket av sedimentslitasje. En mulig løsning er å forbedre sandfanget for å redusere mengden sedimenter som når turbinene. I dette ... -
A Numerical Study of Flow Structures and Flame Shape Transition in Swirl-Stabilized Turbulent Premixed Flames Subject to Local Extinction
(Peer reviewed; Journal article, 2023)Large Eddy Simulations (LES) of turbulent lean-premixed flames of V and M-shape are presented. A simple algebraic closure with the ability to capture finite-rate chemistry effects is used for subgrid reaction rate modeling. ... -
Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers
(Peer reviewed; Journal article, 2021)Required refrigerant charge in heat pump systems with propane is analyzed. Two systems are compared: The first a direct heat pump, with fin-and-tube heat exchangers, and the second an indirect system, with plate heat ... -
Numerical study of hydrogen adsorption
(Master thesis, 2012)The main objective of this thesis is to describe the transient thermodynamics during physisorption of hydrogen gas using a commercial numerical software.Simulations of thermal effects during adsorption are valuable tools ... -
Numerical Study of Hydrogen Inhibition of Char
(Master thesis, 2015)It has been known for a long time that hydrogen in the gas phase tend to inhibit gasification of char at low and intermediate temperatures. At higher temperatures, however, there are indications that hydrogen may speed up ... -
Numerical Study of Hydrogen Inhibition of Char Gasification Using Detailed Hetero- and Homogeneous Chemical Kinetics
(Journal article; Peer reviewed, 2016)It has been known for a long time that hydrogen in the gas phase tends to inhibit gasification of char at low and intermediate temperatures. At higher temperatures, however, there are indications that hydrogen may speed ... -
Numerical study of particle settlement in a sand trap with multiple flow calming structures
(Master thesis, 2023)Et tradisjonelt sandfang i et vannkraftverk reduserer strømningshastigheten slik at sedimenter som transporteres kan skilles ut fra vannet. For å minimere turbinerosjon forårsaket av partikler er det nødvendig å optimere ... -
Numerical Study of Radiation Hazard from Advanced Flare Systems at Process Plants
(Master thesis, 2016)This thesis investigates how to optimize the calculation of thermal radiation from an advanced flare system in the numerical computation tool Kameleon FireEx (KFX). Measured radiation levels from a real flaring scenario ... -
Numerical study of surface waves on a shear current - Waves behind a surface obstacle
(Master thesis, 2018)This master's thesis has made investigation into waves and currents interaction numerically by the use of an oscillating cylinder as a wave-maker. Three cases were investigated: still water, uniform flow and linear shear ... -
Numerical study of unsteady flow in slits and investigation of methods to reduce pressure pulsations in pipes
(Master thesis, 2020)Noe av vannet som strømmer gjennom en Francis turbin lekker opp over løpehjulet mot øvre lokk. Dette vannet evakueres gjennom små spalter i lokket, og ledes videre gjennom et rørsystem til et kjølevannsbasseng. Virvelavløsninger ... -
Numerical Study of Wave Characteristics during Density Wave Oscillations in a horizontal, heated Channel
(Master thesis, 2014)Boiling flow in steam generators, water cooled reactors and other multiphase processes can be subject to instabilities. One of the main types of instabilities is DWO, a low amplitude and high frequency phenomenon. DWO can ... -
A numerical study on the combustion of a resolved carbon particle
(Journal article; Peer reviewed, 2021)Combustion of a single, resolved carbon particle is studied using a novel numerical approach that makes use of an overset grid. The model is implemented into the framework of a compressible Direct Numerical Simulation (DNS) ... -
Numerical viscosity in large time step hll-type schemes
(Journal article; Peer reviewed, 2018)We consider Large Time Step (LTS) methods, i.e., the explicit finite volume methods not limited by the Courant–Friedrichs–Lewy (CFL) condition. The original LTS method (LeVeque in SIAM J Numer Anal 22, 1985) was constructed ... -
Numerisk analyse (CFD) av stempelpumpe
(Master thesis, 2010)I denne oppgåva er det sett nærare på lekkasjar i stempelpumper. I starten presenterast den nødvendige teorien for CFD, pumper og spalter. Ein definerer deformasjons-lekkasje/trykk-lekkasje som eit forhold. Berekningar ... -
Numerisk analyse av prosessutstyr v.h.a. parallelle beregninger
(Master thesis, 2008)Denne masteroppgaven har hatt to hoveddeler. Teste ut David-Server som er et lite tungregneanlegg plassert ved Institutt for energi- og prosessteknikk, designe en modell for bunnkoker butansplitter Kårstø prosessanlegg. ... -
Numerisk modellering av dam-spredning, varmeoverføring og brann i flytende naturgass (LNG)
(Master thesis, 2009)Denne oppgaven har sett på modellering av spredning og fordamping av dammer på faste underlag bestående av kryogene væsker. En modell basert på grunt vann-ligningene har blitt utledet. Grunt vann-ligningene består av: én ... -
Numerisk modellering av varmeoverføring og brann i flytende naturgass (LNG)
(Master thesis, 2008)Denne oppgaven tar for seg lekkasje, spredning og fordamping av flytende naturgass (LNG) på vann, uten forbrenning. Det er sett nærmere på noen av de fysiske prosessene som ligger til grunn og hvordan disse vil kunne påvike ...