Browsing NTNU Open by Author "Johnsen, Sverre Gullikstad"
Now showing items 1-17 of 17
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A Wall-Function Approach for Direct Precipitation/Crystallization Fouling in CFD Modelling
Johnsen, Sverre Gullikstad; Johansen, Stein Tore; Wittgens, Bernd (Conference object; Lecture; Peer reviewed, 2015)The main objective of this paper is to present a generic modelling framework, for the diffusive mass transport through the turbulent, reactive boundary layer of multi-component fluid mixtures that ... -
An Analytical Mathematical Theoretical Study of Single-Well Push-Pull ”Echo” Tests
Johnsen, Sverre Gullikstad (Doktoravhandlinger ved NTNU, 1503-8181; 2007:122, Doctoral thesis, 2007)Analysis of stream-line-based formulations is exercised to develop a stream-line based semi-analytical model for the single-well push-pull test, taking into account natural ground-water drift. The model is employed to ... -
Capillary forces as a limiting factor for sawing of ultrathin silicon wafers by diamond multi-wire saw
Ryningen, Birgit; Tetlie, Pål; Johnsen, Sverre Gullikstad; Dalaker, Halvor (Peer reviewed; Journal article, 2020)Succeeding with ultrathin silicon wafer sawing by diamond multi-wire saw, is not only a matter of optimization; the challenges of thin wafer production and the capability limit have not yet been fully understood. In this ... -
CFD Simulations of Turbulent Flow in the Human Upper Airways
Aasgrav, Elin; Johnsen, Sverre Gullikstad; Simonsen, Are Johan; Müller, Bernhard (Chapter, 2017)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. ... -
CFD Simulations of Turbulent Flow in the Human Upper Airways
Aasgrav, Elin; Johnsen, Sverre Gullikstad; Simonsen, Are Johan; Müller, Bernhard (Chapter, 2017)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. ... -
Digitalisering av energi sektoren
Oftedal, Sara; Rørvik, Eilif Søreide (Bachelor thesis, 2019)Repsol er i ferd med å utvikle Nidaros feltet og vil lære av erfaringer gjort ved Kalvskinnet feltet. Erfaringene fra Kalvskinnet er at feltet hadde store produksjonstap knyttet til uplanlagte hendelser, og da spesielt ... -
Enabling Efficient Heat Recovery from Aluminium Pot Gas
Clos, Daniel Perez; Andresen, Trond; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth (Chapter, 2017)In the present work, previous studies carried out by the Norwegian aluminium industry and research centres with the aim of recovering heat from aluminium production off-gas, are reviewed. The main challenge in improving ... -
Hardhetsreduksjon i varmepåvirket sone ved sveisereparasjon på utstyr i drift
Stegavik, Ståle Singstad; Kristensen, Jørgen; Stolpnes, Thomas (Bachelor thesis, 2020)Denne rapporten tar for seg identifisering og testing av en mulig metode å gjennomføre sveisereparasjoner av korrosjonsskader på utstyr i drift på olje- og gassanlegg. Eksempler på slikt utstyr er rør og tanker. Bakgrunnen ... -
Implementation, Demonstration and Validation of a User-Defined Wall Function for Direct Precipitation Fouling in Ansys Fluent
Johnsen, Sverre Gullikstad; Pääkkönen, Tiina; Johansen, Stein Tore; Keiski, Riitta; Wittgens, Bernd (Chapter, 2017)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 ... -
Implementation, Demonstration and Validation of a User-Defined Wall Function for Direct Precipitation Fouling in Ansys Fluent
Johnsen, Sverre Gullikstad; Pääkkönen, Tiina; Johansen, Stein Tore; Keiski, Riitta; Wittgens, Bernd (Conference object; Lecture, 2017)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 ... -
Investigation on scale formation in aluminium industry by means of a cold-finger
Clos, Daniel Perez; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth (Journal article; Peer reviewed, 2019)A cylindrical fouling probe or “cold-finger” has been used to investigate fouling from aluminium production off-gas. The probe was located upstream from the off-gas cleaning system. Surface deposits have been collected for ... -
Measures to reduce emissions from offshore drilling units
Rølland, Kristina Nygaard; Øye, Vegar Hovdenakk; Godvindapillai, Shayangi (Bachelor thesis, 2020)Hensikten med denne bacheloroppgaven har vært å studere hvordan Lundin Energy Norge AS sin lete- og produksjons aktivitet bidrar selskapets totale utslipp av CO2 og NOx, både i et historisk og fremtidig perspektiv, og for ... -
Patient Specific Numerical Simulation of Flow in the Human Upper Airways for Assessing the Effect of Nasal Surgery
Jordal, Maria Rolstad; Johnsen, Sverre Gullikstad; Dahl, Sigrid Kaarstad; Müller, Bernhard (Lecture, 2017)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 ... -
Patient Specific Numerical Simulation of Flow in the Human Upper Airways for Assessing the Effect of Nasal Surgery
Jordal, Maria Rolstad; Johnsen, Sverre Gullikstad; Dahl, Sigrid Kaarstad; Müller, Bernhard (Chapter, 2017)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 ... -
Patient specific numerical simulation of flow in the human upper airways, for assessing the effect of nasal surgery
Jordal, Maria Rolstad; Johnsen, Sverre Gullikstad; Dahl, Sigrid Kaarstad; Panjwani, Balram; Müller, Bernhard (Lecture, 2016) -
Towards optical quantum computing
Johnsen, Sverre Gullikstad (Master thesis, 2003) -
Vurdering av borevæske alternativer for Frigg feltutvikling
Dyrendalsli,Tove; Lomeland, Lene Taugbøl (Bachelor thesis, 2019)Valg av borevæsker er en vesentlig del av det teknologiske valget under planlegging av boreoperasjonen i feltutviklingsplanen. Den mest kostnadseffektive metoden er ønsket, men det miljømessige avtrykket er også et viktig ...