Kowalski, Julia

[["dc.bibliographiccitation.firstpage","127"],["dc.bibliographiccitation.lastpage","144"],["dc.contributor.author","Schüller, Kai"],["dc.contributor.author","Berkels, Benjamin"],["dc.contributor.author","Kowalski, Julia"],["dc.contributor.editor","Schäfer, Michael"],["dc.contributor.editor","Behr, Marek"],["dc.contributor.editor","Mehl, Miriam"],["dc.contributor.editor","Wohlmuth, Barbara"],["dc.date.accessioned","2020-11-24T15:05:39Z"],["dc.date.available","2020-11-24T15:05:39Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1007/978-3-319-93891-2_8"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69264"],["dc.publisher","Springer"],["dc.relation.isbn","978-3-319-93890-5"],["dc.relation.isbn","978-3-319-93891-2"],["dc.relation.ispartof","Recent Advances in Computational Engineering"],["dc.title","Integrated Modeling and Validation for Phase Change with Natural Convection"],["dc.type","book_chapter"],["dc.type.internalPublication","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1276"],["dc.bibliographiccitation.journal","International journal of heat and mass transfer"],["dc.bibliographiccitation.lastpage","1287"],["dc.bibliographiccitation.volume","115"],["dc.contributor.author","Schüller, K."],["dc.contributor.author","Kowalski, J."],["dc.date.accessioned","2020-11-24T14:12:53Z"],["dc.date.available","2020-11-24T14:12:53Z"],["dc.date.issued","2017-04-03"],["dc.description.abstract","Close-contact melting refers to the process of a heat source melting its way into a phase-change material. Of special interest is the close-contact melting velocity, or more specifically the relative velocity between the heat source and the phase-change material. In this work, we present a novel numerical approach to simulate quasi-steady, heat flux driven close-contact melting. It extends existing approaches found in the literature, and, for the first time, allows to study the impact of a spatially varying heat flux distribution. We will start by deriving the governing equations in a Lagrangian reference frame fixed to the heat source. Exploiting the narrowness of the melt film enables us to reduce the momentum balance to the Reynolds equation, which is coupled to the energy balance via the velocity field. We particularize our derivation for two simple, yet technically relevant geometries, namely a 3d circular disc and a 2d planar heat source. An iterative solution procedure for the coupled system is described in detail and discussed on the basis of a convergence study. Furthermore, we present an extension to allow for rotational melting modes. Various test cases demonstrate the proficiency of our method. In particular, we will utilize the method to assess the efficiency of the close-contact melting process and to quantify the model error introduced if convective losses are neglected. Finally, we will draw conclusions and present an outlook to future work."],["dc.identifier.arxiv","1704.00503v1"],["dc.identifier.doi","10.1016/j.ijheatmasstransfer.2017.08.092"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69228"],["dc.relation.issn","0017-9310"],["dc.title","A Lagrangian approach to modeling heat flux driven close-contact melting"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","21"],["dc.bibliographiccitation.journal","Cold regions science and technology"],["dc.bibliographiccitation.lastpage","30"],["dc.bibliographiccitation.volume","74-75"],["dc.contributor.author","Fischer, Jan-Thomas"],["dc.contributor.author","Kowalski, Julia"],["dc.contributor.author","Pudasaini, Shiva P."],["dc.date.accessioned","2020-11-24T15:04:22Z"],["dc.date.available","2020-11-24T15:04:22Z"],["dc.date.issued","2012"],["dc.identifier.doi","10.1016/j.coldregions.2012.01.005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69250"],["dc.relation.issn","0165-232X"],["dc.title","Topographic curvature effects in applied avalanche modeling"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","101"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","EPL"],["dc.bibliographiccitation.lastpage","106"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Söding, J."],["dc.contributor.author","Grimm, R"],["dc.contributor.author","Kowalski, J."],["dc.contributor.author","Ovchinnikov, Yu. B"],["dc.contributor.author","Sidorov, A. I"],["dc.date.accessioned","2022-06-08T07:57:21Z"],["dc.date.available","2022-06-08T07:57:21Z"],["dc.date.issued","2007"],["dc.identifier.doi","10.1209/0295-5075/20/2/002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/110062"],["dc.notes.intern","DOI-Import GROB-575"],["dc.relation.eissn","1286-4854"],["dc.relation.issn","0295-5075"],["dc.title","Observation of the Magneto-Optical Radiation Force by Laser Spectroscopy"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Geophysical Research. G, Biogeosciences"],["dc.bibliographiccitation.volume","125"],["dc.contributor.author","Serrano‐Ortiz, P."],["dc.contributor.author","Aranda‐Barranco, S."],["dc.contributor.author","López‐Ballesteros, A."],["dc.contributor.author","Lopez‐Canfin, C."],["dc.contributor.author","Sánchez‐Cañete, E.P."],["dc.contributor.author","Meijide, A."],["dc.contributor.author","Kowalski, A.S."],["dc.date.accessioned","2021-04-14T08:27:48Z"],["dc.date.available","2021-04-14T08:27:48Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1029/2019JG005169"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82407"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","2169-8961"],["dc.relation.issn","2169-8953"],["dc.title","Transition Period Between Vegetation Growth and Senescence Controlling Interannual Variability of C Fluxes in a Mediterranean Reed Wetland"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","959"],["dc.bibliographiccitation.lastpage","975"],["dc.contributor.author","Niedermeier, H."],["dc.contributor.author","Clemens, J."],["dc.contributor.author","Kowalski, J."],["dc.contributor.author","Macht, S."],["dc.contributor.author","Heinen, D."],["dc.contributor.author","Hoffmann, R."],["dc.contributor.author","Linder, P."],["dc.date.accessioned","2020-11-24T15:05:18Z"],["dc.date.available","2020-11-24T15:05:18Z"],["dc.date.issued","2014"],["dc.identifier.doi","10.1109/PLANS.2014.6851461"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69260"],["dc.relation.eventend","2014-05-08"],["dc.relation.eventlocation","Monterey, CA, USA"],["dc.relation.eventstart","2014-05-05"],["dc.relation.isbn","978-1-4799-3320-4"],["dc.relation.isbn","978-1-4799-3319-8"],["dc.relation.ispartof","2014 IEEE/ION Position, Location and Navigation Symposium"],["dc.title","Navigation system for a research ice probe for antarctic glaciers"],["dc.type","conference_paper"],["dc.type.internalPublication","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","84"],["dc.bibliographiccitation.journal","Annals of Glaciology"],["dc.bibliographiccitation.lastpage","88"],["dc.bibliographiccitation.volume","38"],["dc.contributor.author","Heierli, Joachim"],["dc.contributor.author","Purves, Ross S."],["dc.contributor.author","Felber, Andreas"],["dc.contributor.author","Kowalski, Julia"],["dc.date.accessioned","2020-11-24T15:05:11Z"],["dc.date.available","2020-11-24T15:05:11Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.3189/172756404781815095"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69259"],["dc.relation.issn","0260-3055"],["dc.relation.issn","1727-5644"],["dc.title","Verification of nearest-neighbours interpretations in avalanche forecasting"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","884"],["dc.bibliographiccitation.journal","International journal of heat and mass transfer"],["dc.bibliographiccitation.lastpage","892"],["dc.bibliographiccitation.volume","92"],["dc.contributor.author","Schüller, K."],["dc.contributor.author","Kowalski, J."],["dc.contributor.author","Råback, P."],["dc.date.accessioned","2020-11-24T14:13:21Z"],["dc.date.available","2020-11-24T14:13:21Z"],["dc.date.issued","2016"],["dc.identifier.doi","10.1016/j.ijheatmasstransfer.2015.09.046"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69231"],["dc.relation.issn","0017-9310"],["dc.title","Curvilinear melting – A preliminary experimental and numerical study"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","32"],["dc.bibliographiccitation.journal","Journal of Magnetic Resonance"],["dc.bibliographiccitation.lastpage","44"],["dc.bibliographiccitation.volume","220"],["dc.contributor.author","Olaru, Alexandra Maria"],["dc.contributor.author","Kowalski, Julia"],["dc.contributor.author","Sethi, Vaishali"],["dc.contributor.author","Blümich, Bernhard"],["dc.date.accessioned","2020-11-24T15:05:23Z"],["dc.date.available","2020-11-24T15:05:23Z"],["dc.date.issued","2012-07"],["dc.description.abstract","In this paper we consider low Péclet number flow in bead packs. A series of relaxation exchange experiments has been conducted and evaluated by ILT analysis. In the resulting correlation maps, we observed a collapse of the signal and a translation towards smaller relaxation times with increasing flow rates, as well as a signal tilt with respect to the diagonal. In the discussion of the phenomena we present a mathematical theory for relaxation exchange experiments that considers both diffusive and advective transport. We perform simulations based on this theory and discuss them with respect to the conducted experiments."],["dc.identifier.doi","10.1016/j.jmr.2012.04.015"],["dc.identifier.pmid","22683579"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69261"],["dc.language.iso","en"],["dc.relation.eissn","1096-0856"],["dc.relation.issn","1090-7807"],["dc.title","Exchange relaxometry of flow at small Péclet numbers in a glass bead pack"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5423"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","The Cryosphere"],["dc.bibliographiccitation.lastpage","5445"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Simson, Anna"],["dc.contributor.author","Löwe, Henning"],["dc.contributor.author","Kowalski, Julia"],["dc.date.accessioned","2022-01-11T14:07:58Z"],["dc.date.available","2022-01-11T14:07:58Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract. A coupled treatment of transport processes, phase changes and mechanical settling is the core of any detailed snowpack model. A key concept underlying the majority of these models is the notion of layers as deforming material elements that carry the information on their physical state. Thereby an explicit numerical solution of the ice mass continuity equation can be circumvented, although with the downside of virtual no flexibility in implementing different coupling schemes for densification, phase changes and transport. As a remedy we consistently recast the numerical core of a snowpack model into an extendable Eulerian–Lagrangian framework for solving the coupled non-linear processes. In the proposed scheme, we explicitly solve the most general form of the ice mass balance using the method of characteristics, a Lagrangian method. The underlying coordinate transformation is employed to state a finite-difference formulation for the superimposed (vapor and heat) transport equations which are treated in their Eulerian form on a moving, spatially non-uniform grid that includes the snow surface as a free upper boundary. This formulation allows us to unify the different existing viewpoints of densification in snow or firn models in a flexible way and yields a stable coupling of the advection-dominated mechanical settling with the remaining equations. The flexibility of the scheme is demonstrated within several numerical experiments using a modular solver strategy. We focus on emerging heterogeneities in (two-layer) snowpacks, the coupling of (solid–vapor) phase changes with settling at layer interfaces and the impact of switching to a non-linear mechanical constitutive law. Lastly, we discuss the potential of the scheme for extensions like a dynamical equation for the surface mass balance or the coupling to liquid water flow."],["dc.description.abstract","Abstract. A coupled treatment of transport processes, phase changes and mechanical settling is the core of any detailed snowpack model. A key concept underlying the majority of these models is the notion of layers as deforming material elements that carry the information on their physical state. Thereby an explicit numerical solution of the ice mass continuity equation can be circumvented, although with the downside of virtual no flexibility in implementing different coupling schemes for densification, phase changes and transport. As a remedy we consistently recast the numerical core of a snowpack model into an extendable Eulerian–Lagrangian framework for solving the coupled non-linear processes. In the proposed scheme, we explicitly solve the most general form of the ice mass balance using the method of characteristics, a Lagrangian method. The underlying coordinate transformation is employed to state a finite-difference formulation for the superimposed (vapor and heat) transport equations which are treated in their Eulerian form on a moving, spatially non-uniform grid that includes the snow surface as a free upper boundary. This formulation allows us to unify the different existing viewpoints of densification in snow or firn models in a flexible way and yields a stable coupling of the advection-dominated mechanical settling with the remaining equations. The flexibility of the scheme is demonstrated within several numerical experiments using a modular solver strategy. We focus on emerging heterogeneities in (two-layer) snowpacks, the coupling of (solid–vapor) phase changes with settling at layer interfaces and the impact of switching to a non-linear mechanical constitutive law. Lastly, we discuss the potential of the scheme for extensions like a dynamical equation for the surface mass balance or the coupling to liquid water flow."],["dc.identifier.doi","10.5194/tc-15-5423-2021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/97903"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-507"],["dc.relation.eissn","1994-0424"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Elements of future snowpack modeling – Part 2: A modular and extendable Eulerian–Lagrangian numerical scheme for coupled transport, phase changes and settling processes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]