Sverre Gullikstad Johnsen
Sverre Gullikstad Johnsen
Publikasjoner og ansvarsområder
Investigation of CFD simulations of flow in the upper airways
This Master's thesis extends previous work conducted in the collaboration project called Modelling of obstructive sleep apnea by fluid-structure interaction in the upper airways. The main objective of the current work was to investigate the importance of including turbulence in CFD models of the hum...
CFD Simulations of Turbulent Flow in the Human Upper Airways
In this paper, investigations are conducted using Reynolds-averaged Navier-Stokes (RANS) turbulence models to investigate the importance of turbulence modelling for nasal inspiration at a constant flow rate of 250 ml/s. Four different, standard turbulence models are tested in a model geometry based ...
Implementation, Demonstration and Validation of a User-Defined Wall Function for Direct Precipitation Fouling in Ansys Fluent
In a previous paper (Johnsen et al., 2015) and presentation (Johnsen et al., 2016), we developed and demonstrated a generic modelling framework for the modelling of direct precipitation fouling from multi-component fluid mixtures that become super-saturated at the wall. The modelling concept involve...
Patient Specific Numerical Simulation of Flow in the Human Upper Airways for Assessing the Effect of Nasal Surgery
The study is looking into the potential of using computational fluid dynamics (CFD) as a tool for predicting the outcome of surgery for alleviation of obstructive sleep apnea syndrome (OSAS). From pre- and post-operative computed tomography (CT) of an OSAS patient, the pre- and post-operative geomet...
Enabling Efficient Heat Recovery from Aluminium Pot Gas
Implementation and Demonstration of a Boundary Condition Wall Function for Direct Precipitation Fouling CFD Modelling
In a previous paper we developed a generic modelling framework, for the diffusive mass transport through the turbulent boundary-layer of multi-component, reactive flows where one or more species may deposit on the wall. In the current paper, we describe the implementation of the modelling framework ...
Patient specific numerical simulation of flow in the human upper airways, for assessing the effect of nasal surgery
Bruker matematikk mot søvnapné
Patient specific numerical simulation of flow in the human upper airways
In this master thesis, a patient specific computational fluid dynamics (CFD) study has been done on the air flow in the human upper airways before and after surgical intervention. The patient studied is a 67 years old man who went from having moderate obstructive sleep apnea syndrome (OSAS), to clos...