Search Results - "Kollmann, W"

Three-dimensional topology of turbulent premixed flame interaction by Griffiths, R.A.C., Chen, J.H., Kolla, H., Cant, R.S., Kollmann, W.

“…The topology of turbulent premixed flames is analysed using data from Direct Numerical Simulation (DNS), with emphasis on the statistical geometry of…”
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Accurate numerical simulations of vortex flows. I: Vortex breakdown by Kollmann, W.

“…Vortex breakdown in uniform axial flow is investigated numerically by solving the Navier–Stokes equations using a hybrid spectral – finite difference method…”
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Accurate numerical simulations of vortex flows II: Interaction of swirling vortex rings by Kollmann, W.

“…An accurate numerical method is applied to the investigation of the flow generated by two co-rotating vortex rings with axial flow in opposite direction at the…”
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Simulation of vorticity dominated flows using a hybrid approach. I: Formulation by Kollmann, W.

“…The formulation of a numerical solution method for the Navier–Stokes equations in domains with cylindrical boundaries based on a hybrid spectral – finite…”
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Simulation of vorticity dominated flows using a hybrid approach. II: Numerical method by Kollmann, W.

“…A family of numerical methods for the solution of the incompressible Navier–Stokes equations in cylindrical coordinates is developed. The formulation for…”
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Critical points and manifolds of the Lamb vector field in swirling jets by Kollmann, W.

“…The Lamb vector field in a swirling jet flow at a Reynolds number in the transitional regime is computed for kinematic analysis. The vector lines for the Lamb…”
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A Compressible Pressure-based Solution Algorithm for Gas Turbine Combustion Chambers Using the PDF/FGM Model by Klapdor, E. V., di Mare, F., Kollmann, W., Janicka, J.

“…The investigation of the complex flow interactions occurring between combustion chamber outflow and turbine nozzle guiding vanes in gas turbines has been the…”
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DNS of the collision of co-axial vortex rings by Kollmann, W., Prieto, Maria I.

“…► Numerical simulation of the collision of coaxial vortex rings at ReΓ=1000–3000. ► Linear stability of the axi-symmetric collision flow. ► Full Navier–Stokes…”
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Moment Invariants for the Analysis of 2D Flow Fields by Schlemmer, M., Heringer, M., Morr, F., Hotz, I., Bertram, M.-H., Garth, C., Kollmann, W., Hamann, B., Hagen, H.

“…We present a novel approach for analyzing two-dimensional (2D) flow field data based on the idea of invariant moments. Moment invariants have traditionally…”
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Formation of a recirculation zone in low Re-number turbulence by Kollmann, W., Umont, G.

“…The formation of a recirculation bubble in swirling jets is investigated using direct simulation results and the pole conditions for the azimuthal Fourier…”
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P-1307 - Being immune to stigma and being able to counteract it by Sibitz, I, Kollmann, W, Schrank, B, Amering, M

“…Background Stigma resistance, an individual's capacity to counteract the stigma of mental illness, emerged as a separate construct (Sibitz et al. 2011)…”
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P03-251 - The role of stigma resistance in persons with schizophrenia and schizoaffective disorder by Kollmann, W, Amering, M, Schrank, B, Sibitz, I

“…Introduction The stigma of schizophrenia is well established as a complicating feature of psychiatric treatment. The fight against stigma and discrimination…”
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The mechanism of two-dimensional pocket formation in lean premixed methane-air flames with implications to turbulent combustion by Chen, Jacqueline H., Echekki, Tarek, Kollmann, Wolfgang

“…The mechanism of unburnt pocket formation in an unsteady two-dimensional premixed lean methane-air flame is investigated using direct numerical simulations…”
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Multifield by Janicke, H, Wiebel, A, Scheuermann, G, Kollmann, W

“…Modern unsteady (multi-)field visualizations require an effective reduction of the data to be displayed. From a huge amount of information the most informative…”
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New innovative materials for advanced electrochemical applications in battery and fuel cell systems by Voß, S, Kollmann, H, Kollmann, W

“…The advanced material POLYMET is an innovative high tech polymer with a three-dimensional polymeric structure metallized with an enclosing coating of different…”
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Incidence and possible causes of dental pain during simulated high altitude flights by Kollmann, W

“…Of 11,617 personnel participating in simulated high altitude flights up to 43,000 feet, only 30 (0.26%) complained of toothache (barodontalgia). The cause of…”
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The pdf approach to turbulent flow by Kollmann, W.

“…This paper provides a detailed discussion of the theory and application of probability density function (pdf) methods, which provide a complete statistical…”
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Cumulant expansion technique for the pdf formulation of turbulent combustion by Karakas, A, Kollmann, W

“…A systematic exposition of single-point pdf methods for reacting flows based on cumulant expansion techniques is carried out. A second order approximation for…”
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Accurate numerical simulations of vortex flows. I: Vortex breakdown: Implicit Solutions of Navier-Stokes Equations by KOLLMANN, W

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Accurate numerical simulations of vortex flows II: Interaction of swirling vortex rings: Implicit Solutions of Navier-Stokes Equations by KOLLMANN, W

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