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Blar i NTNU Open på forfatter "Johnsen, Sverre Gullikstad"

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Viser treff 1-17 av 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 (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 ...
    • 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 ...
    • 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 ...

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