Reynoldszahleffekte an Anhaengen Schlussbericht

SIGLEAvailable from TIB Hannover: F00B1172 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman

Einsatzerprobung eines Trommelskimmers zur Oelunfallbekaempfung der POLARSTERN Schlussbericht

In 1991, the Alfred-Wegener-Institut fuer Polar- und Meeresforschung (AWI) acquired an instrument for oil spill abatement on board the vessel POLARSTERN. The device is a skimmer drum for removing layers of oil and binder floating on water. It will be kept on board the POLARSTERN for use in case of an oil spill accident. One important component is the binder ELASTOL, which is sprayed on the oil layer in powder form. This non-toxic, floating binder dissolves in oil and raises the viscoeleasticity of the oil layer. Together with the oil, it forms a viscous, adhesive mass which can be taken up by the skimmer drum and discharged into a receiver, from where it is removed into the ship's collector tanks. The Hamburgische Schiffbau-Versuchsanstalt GmbH (HSVA) carried out a research project in which questions concerning the optimisation and limits of application of the skimmer drum were to be answered in seawater tank experiments. (orig.)Im Jahre 1991 wurde vom Alfred-Wegener-Institut fuer Polar- und Meeresforschung (AWI) die Beschaffung eines Geraetes zur Oelunfallbekaempfung der POLARSTERN veranlasst. Bei diesem Geraet handelt es sich um einen Trommelskimmer, mit dem eine auf dem Wasser schwimmende Oel-Bindemittelschicht aufgenommen werden kann. Das Geraet soll demnaechst auf der POLARSTERN plaziert werden und im Falle eines Oelunfalls zur Bekaempfung eingesetzt werden. Ein wesentlicher Bestandteil des Bekaempfungsverfahrens ist das in Pulverform auf die Oelschicht verspruehte Bindemittel ELASTOL. Dieses ungiftige und schwimmfaehige Bindemittel loest sich in Oel und erhoeht dabei dessen Viskoelastizitaet. Zusammen mit dem Oel bildet es eine zaehfluessige, adhaesive Masse, die von dem Trommelskimmer aufgenommen und in einen Receiver abgestreift wird. Vom Receiver wird das Oel-Bindemittel-Gemisch in die auf dem Schiff vorhandenen Sammeltanks gefoerdert. Die Hamburgische Schiffbau-Versuchsanstalt GmbH (HSVA) sollte in einem FE-Vorhaben Fragen zur Optimierung sowie zu den Grenzen der Einsatzfaehigkeit des Trommelskimmers in ihrem Umwelt-Versuchsbecken untersuchen. (orig.)SIGLEAvailable from TIB Hannover: RN 3770(233) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Optische Messung der Wellentopologie - HSVA Teil

Available from TIB Hannover: RN 3150(1638) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Binnenschiffahrt bei Eisbedeckung Bericht und Anhang

Published in two volumesSIGLEAvailable from TIB Hannover: RN 3770(287)+a: RN 3770(287,Anh)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

Untersuchung des Seeverhaltens von schnellen Gleitkatamaranen

Available from TIB Hannover: RN 3150(1584)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Propeller-Kavitation und propellererregte Druckschwankungen auf der Basis eines potentialorientierten Randelemente-Verfahrens

Available from TIB Hannover: RN 3150(1639) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Berechnung von Schiffsumstroemungen mit brechenden Wellen Abschlussbericht

A finite volume method to compute the inviscid flow around a shiphull at the free (water) surface is described. The method is used to predict the flow around fast, slender ships as well as more blunt hullforms. Computed wave fields for a Series 60 hull show very good agreement with experimental data. Subsequent grid refinement allows to resolve even smallest structures in the wave pattern obtained experimentally. The wave resistance predicted for a slender hullform also shows a good agreement with experimental data, even for practical grid sizes. Blunt hullforms, e.g. tankers, require finer grids to accurately predict the wave resistance. Typical workstation computing power appears to be insufficient to predict the wave resistance at reasonable computational effort. Although the grids used for two different tanker hulls appear to be too coarse to predict the absolute value of the waveresistance, the tendency could be captured well. A partially submerged bulbous bow means no constraint. The application of the method is presently hampered by relatively high computer time consumption. This in turn does also limit the investigation of required grid sizes and grid independency. Further inclusions of trim and sinkage are to be expected soon. (orig.)Available from TIB Hannover: RN 3150(1624)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Methode zur Berechnung der kavitierenden Stroemung als 2-Phasen Stroemung Abschlussbericht

The present report describes a method to predict cavitation inception and development on hydrofoil sections by means of a 2 phase model. Two different concepts for the modelling of cavitation phenomena are shown. The first method -as initially proposed - features a pressure density relation that was integrated in an existing commercial RANSE Solver (Star CD). The limits of this method become clear when examining a typical velocity and pressure range. The sensitivity of the computed pressure is to high in order to predict reasonable results. A second alternative was developed to model the cavitating flow analogous to the prediction of a free surface in a fluid using an inviscid Volume of Fluid (VOF) method. The boundary between a fluid phase (water) and vapour is treated exactly in the same way as a free water surface. Cavitation inception on a body is stimulated when the local pressure falls under the given cavitation pressure described by the cavitation number #sigma#_v. The developing cavitation bubble is modelled by means of an additional source distribution. A transient computation is performed to find a new state of equilibrium. The method was tested using simple geometrical examples, e.g. a step in a canal. Parameters describing the source distribution were determined using this model. A comprehensive study of foil sections was performed and documented. Further, options for the extension of the method are described. Although the second approach using the inviscid VOF method does not comply with the initial idea of modelling cavitating flows by real 2 phase models, results appear to justify this method finally chosen. Extensive development work unfortunately did not allow to cover all aspects initially proposed, e.g. 3 dimensional flows over hydrofoils. The method developed however appears to be a prerequisite for a successful extension into 3 dimensions. (orig.)SIGLEAvailable from TIB Hannover: RN 3150(1627)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Vereinfachte Methode zur Leistungsprognose unter genauer Erfassung der Wechselwirkung zwischen Schiffsrumpf, Ruder und Propeller

Available from TIB Hannover: RN 3150(1637)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Untersuchung zur Manoevrierfaehigkeit von SWATH-Schiffen (Modellversuche)

The report describes the model tests performed with different SWATH configurations and the corresponding results. Altogether seven configurations were tested. Beside three strut variants (overhanging and shortened single struts, and twin struts) the investigation also embraced a draught and a hull separation modification. In the case of the shortened single struts the single strut with hull combination was tested alone. Furthermore the case of two through struts without hulls was investigated. The model tests mainly served as verification of a mathematical approach (to be developed by MTG Marinetechnik GmbH, Hamburg) to determine the hydrodynamic forces acting on the ship during sway and yaw motions. This aside, the model tests served as basic tests with regard to particular specialized problems. (orig.)SIGLEAvailable from TIB Hannover: RN 3150(1597)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman