Browsing SINTEF Open by Author "Haugen, Nils Erland L"
Now showing items 21-38 of 38
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Fully resolved simulations of single char particle combustion using a ghost-cell immersed boundary method
Luo, Kun; Mao, Chaoli; Fan, Jianren; Zhuang, Zhenya; Haugen, Nils Erland L (Journal article; Peer reviewed, 2018) -
Investigation of an Innovative Latent Heat Storage Concept in a Stovepipe
Sevault, Alexis; Soibam, Jerol; Haugen, Nils Erland L; Skreiberg, Øyvind (Journal article; Peer reviewed, 2018)Latent heat storage (LHS) is a promising concept for small-scale batch combustion. One example is wood stoves, which rely on a batch combustion process that yields a transient heat production with high peak effect. A ... -
Numerical approaches for thermochemical conversion of char
Haugen, Nils Erland L; Loong, Brandon Ka Yan; Mitchell, Reginald E. (Peer reviewed; Journal article, 2022)This paper gives a review of the current state of the art for numerical simulations of char conversion. In particular, it presents models that have been developed to describe the physical and chemical phenomena that ... -
Numerical investigation of free-stream turbulence effects on the transition-in-wake state of flow past a circular cylinder
Aarnes, Jørgen Røysland; Andersson, Helge Ingolf; Haugen, Nils Erland L (Journal article; Peer reviewed, 2018)We investigate how a turbulent free-stream (TFS) affects the transition-in-wake state of flow past a cylinder. Direct numerical simulations of a decaying TFS flow past a cylinder have been performed, where the intensity ... -
Numerical models for thermochemical degradation of thermally thick woody biomass, and their application in domestic wood heating appliances and grate furnaces
Haberle, Inge; Skreiberg, Øyvind; Lazar, Joanna; Haugen, Nils Erland L (Journal article; Peer reviewed, 2017)This paper reviews the current state-of-the-art of numerical models used for thermochemical degradation and combustion of thermally thick woody biomass particles. The focus is on the theory of drying, devolatilization and ... -
Numerical simulations of staged biomass grate fired combustion with an emphasis on NOx emissions
Bugge, Mette; Skreiberg, Øyvind; Haugen, Nils Erland L; Carlsson, Per; Houshfar, Ehsan; Løvås, Terese (Journal article; Peer reviewed, 2015)In the present paper NOx emissions from biomass combustion was studied, with the objective to demonstrate the applicability of stationary computational fluid dynamics simulations, including a detailed representation of the ... -
A numerical study on the combustion of a resolved carbon particle
Karchniwy, Ewa Malgorzata; Haugen, Nils Erland L; Klimanek, Adam (Peer reviewed; Journal article, 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) ... -
On the inaccuracies of point-particle approach for char conversion modeling
Jayawickrama, Thamali R.; Haugen, Nils Erland L; Umeki, Kentaro (Peer reviewed; Journal article, 2024)Char conversion is a complex phenomenon that involves not only heterogeneous reactions but also external and internal heat and mass transfer. Reactor-scale simulations often use a point-particle approach (PP approach) as ... -
Phase change materials for thermal energy storage in low- and high-temperature applications: a state-of-the-art
Sevault, Alexis; Kauko, Hanne; Bugge, Mette; Banasiak, Krzysztof; Haugen, Nils Erland L; Skreiberg, Øyvind (SINTEF Energi. Rapport;TR A7638, Research report, 2017) -
Predicting NOx emissions from wood stoves using detailed chemistry and computational fluid dynamics
Bugge, Mette; Skreiberg, Øyvind; Haugen, Nils Erland L; Carlsson, Per; Seljeskog, Morten (Journal article; Peer reviewed, 2015)The present paper addresses NOx emissions from wood stoves through a computational fluid dynamics (CFD) modeling approach. The most significant route for NOx formation in traditional biomass combustion applications is the ... -
Spectral characterisation of inertial particle clustering in turbulence
Haugen, Nils Erland L; Brandenburg, Axel; Sandin, Christer; Mattsson, Lars (Peer reviewed; Journal article, 2022)Clustering of inertial particles is important for many types of astrophysical and geophysical turbulence, but it has been studied predominately for incompressible flows. Here, we study compressible flows and compare ... -
Superchilling, ice fraction and quality
Stevik, Astrid; Haugen, Nils Erland L; Duun, Anne Sissel; Walnum, Harald Taxt; Nordtvedt, Tom Ståle (Chapter; Peer reviewed, 2010) -
Thermophoresis and its effect on particle impaction on a cylinder for low and moderate Reynolds numbers
Haugen, Nils Erland L; Krüger, Jonas; Aarnes, Jørgen Røysland; Karchniwy, Ewa Malgorzata; Klimanek, Adam (Peer reviewed; Journal article, 2021) -
Three-dimensional unsteady numerical simulation of a 150 kWth full-loop chemical looping combustion pilot with biomass as fuel: A hydrodynamic investigation
Sun, Liyan; Masi, Enrica; Simonin, Olivier; Langørgen, Øyvind; Saanum, Inge; Haugen, Nils Erland L (Peer reviewed; Journal article, 2022)A hydrodynamic model for a full Chemical Looping Combustion (CLC) unit was established, and simulations performed using the code NEPTUNE_CFD, which is based on an Euler-Euler approach. The unit is a 150 kWth pilot constructed ... -
Transient CFD simulations of wood stoves with varying heat storage capacity
Bugge, Mette; Haugen, Nils Erland L; Skreiberg, Øyvind (Journal article; Peer reviewed, 2019)In the present work, transient CFD simulations of full wood log combustion cycles have been performed to study the time dependent behavior in cast iron and soapstone wood stoves. A model for the gas release is developed ... -
Turbophoresis in forced inhomogeneous turbulence
Mitra, Dhrubaditya; Haugen, Nils Erland L; Rogachevskii, Igor (Journal article; Peer reviewed, 2018)We show, by direct numerical simulations, that heavy inertial particles (characterized by Stokes number St) in inhomogeneously forced statistically stationary isothermal turbulent flows cluster at the minima of mean-square ... -
Validation of a numerical approach for simulation of the thermal decomposition behaviour of biomass in grate combustion plants
Bugge, Mette; Haugen, Nils Erland L; Li, Tian; Zhang, Jingyuan; Skreiberg, Øyvind (Peer reviewed; Journal article, 2021) -
Varying the forcing scale in low Prandtl number dynamos
Brandenburg, Axel; Haugen, Nils Erland L; Li, Xiang-Yu; Subramanian, Kandaswamy R. (Journal article; Peer reviewed, 2018)Small-scale dynamos are expected to operate in all astrophysical fluids that are turbulent and electrically conducting, for example the interstellar medium, stellar interiors, and accretion discs, where theymay also be ...