Blar i NTNU Open på forfatter "Fonn, Eivind"
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A Step Towards a Reduced Order Modelling of Flow Characterized by Wakes Using Proper Orthogonal Decomposition
Fonn, Eivind; Rasheed, Adil; Tabib, Mandar; Kvamsdal, Trond (Chapter; Peer reviewed, 2017)High fidelity simulations of flow might be quite demanding, because they involve up to O(106 – 109) degrees of freedom and several hours (or even days) of computational time, also on powerful hardware parallel architectures. ... -
A step towards reduced order modelling of flow characterized by wakes using Proper Orthogonal Decomposition
Fonn, Eivind; Tabib, Mandar; Siddiqui, Muhammad Salman; Rasheed, Adil; Kvamsdal, Trond (Journal article; Peer reviewed, 2017)High fidelity simulations of flow can be quite demanding, involving up to O(106) to O(109) degrees of freedom, and several hours or days of computational time, even on powerful parllel architectures. These techniques become ... -
Computing Metrics on Riemannian Shape Manifolds: Geometric shape analysis made practical
Fonn, Eivind (Master thesis, 2009)Shape analysis and recognition is a field ripe with creative solutions and innovative algorithms. We give a quick introduction to several different approaches, before basing our work on a representation introduced by Klassen ... -
Fast divergence-conforming reduced basis methods for stationary and transient flow problems
Fonn, Eivind; van Brummelen, Harald; Kvamsdal, Trond; Rasheed, Adil (Peer reviewed; Journal article, 2020)Reduced basis methods (RB methods or RBMs) form one of the most promising techniques to deliver numerical solutions of parametrized PDEs in real-time with reasonable accuracy [1]. For the Navier-Stokes equation, RBMs based ... -
Fast divergence-conforming reduced basis methods for steady Navier–Stokes flow
Fonn, Eivind; Brummelen, Harald van; Kvamsdal, Trond; Rasheed, Adil (Journal article; Peer reviewed, 2018)Reduced-basis methods (RB methods or RBMs) form one of the most promising techniques to deliver numerical solutions of parametrized PDEs in real-time with reasonable accuracy. For incompressible flow problems, RBMs based ... -
Finite-Volume High-Fidelity Simulation Combined with Finite-Element-Based Reduced-Order Modeling of Incompressible Flow Problems
Fonn, Eivind; Kvamsdal, Trond; Rasheed, Adil (Journal article; Peer reviewed, 2019)We present a nonintrusive approach for combining high-fidelity simulations using Finite-Volume (FV) methods with Proper Orthogonal Decomposition (POD) and Galerkin Reduced-Order Modeling (ROM) methodology. By nonintrusive ... -
Isogeometric methods for CFD and FSI-simulation of flow around turbine blades
van Opstal, Timo Matteo; Fonn, Eivind; Holdahl, Runar; Kvamsdal, Trond; Kvarving, Arne Morten; Mathisen, Kjell Magne; Nordanger, Knut; Okstad, Knut Morten; Rasheed, Adil; Tabib, Mandar (Journal article; Peer reviewed, 2015)Coupled fluid-structure interaction simulations of wind turbines have traditionally been considered computationally too expensive to carry out. However, more powerful computers and better solution techniques based on ... -
Mixed Method for Isogeometric Analysis of Coupled Flow and Deformation in Poroelastic Media
Bekele, Yared Worku; Fonn, Eivind; Kvamsdal, Trond; Kvarving, Arne Morten; Nordal, Steinar (Peer reviewed; Journal article, 2022)Pressure oscillations at small time steps have been known to be an issue in poroelasticity simulations. A review of proposed approaches to overcome this problem is presented. Critical time steps are specified to alleviate ... -
Near wake region of an industrial scale wind turbine: comparing LES-ALM with LES-SMI simulations using data mining (POD)
Tabib, Mandar; Rasheed, Adil; Fonn, Eivind; Siddiqui, Muhammad Salman; Kvamsdal, Trond (Journal article, 2017)Accurate prediction of power generation capability needs proper assessment of blade loading and wake behavior. In this regard, the Sliding Mesh Interface (SMI) approach and the Actuator Line Model (ALM) are two diverse ... -
On interactions between wind turbines and the marine boundary layer
Siddiqui, Muhammad Salman; Rasheed, Adil; Tabib, Mandar; Fonn, Eivind; Kvamsdal, Trond (Chapter; Peer reviewed, 2017)Most mesoscale models are developed with grid resolution in the range of kilometers. Therefore, they may require spatial averaging to analyze flow behavior over the domain of interest. In doing so, certain important features ... -
PoroTwin: A Digital Twin for a FluidFlower Rig
Keilegavlen, Eirik; Fonn, Eivind; Johannessen, Kjetil Andre; Eikehaug, Kristoffer; Both, Jakub Wiktor; Fernø, Martin; Kvamsdal, Trond; Rasheed, Adil; Nordbotten, Jan Martin (Peer reviewed; Journal article, 2022)We present a framework for integrated experiments and simulations of tracer transport in heterogeneous porous media using digital twin technology. The physical asset in our setup is a meter-scale FluidFlower rig. The digital ... -
Reduced Order Modeling Techniques for Non-Affine Problems in Solid Mechanics
Gran, Olav Milian Schmitt (Master thesis, 2022)For å aktivere den fulle kraften til offline-online konseptet i Redusert Ordens Modellering (ROM), må det parametriserte problemet være affint under variasjon av parameterne. Imidlertid er mange relevante problemer, spesielt ... -
Reduced order models for finite-volume simulations of turbulent flow around wind-turbine blades
Tsiolakis, Vasileios; Kvamsdal, Trond; Rasheed, Adil; Fonn, Eivind; Brummelen, Harald van (Journal article; Peer reviewed, 2021) -
Spline based Mesh Generator for high fidelity simulation of flow around turbine blades
Fonn, Eivind; Rasheed, Adil; Kvarving, Arne Morten; Kvamsdal, Trond (Journal article; Peer reviewed, 2015)Mesh generation involving complex geometries, such as wind turbine blades, is highly complicated. The problem is generally addressed using tetrahedral meshes, or hybrid meshes with hexahedral elements close to the body and ...