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  • FLUID MECHANICS AND HEAT TRANSFER  (14)
  • ASTRONAUTICS (GENERAL)  (7)
  • 1985-1989  (21)
  • 1
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    Interface stability in a slowly rotating low-gravity tank Theory (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The equilibrium configuration of a bubble in a rotating liquid confined by flat axial boundaries (baffles) is found. The maximum baffle spacing assuring bubble confinement is bounded from above by the natural length of a bubble in an infinite medium under the same conditions. Effects of nonzero contact angle are minimal. The problem of dynamic stability is posed. It can be solved in the limit of rapid rotation, for which the bubble is a long cylinder. Instability is to axisymmetric perturbations; nonaxisymmetric perturbations are stable. The stability criterion agrees with earlier results.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: AIAA PAPER 86-0198
    Format: text
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  • 2
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    Multigrid techniques for the solution of the passive scalar advection-diffusion equation (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The solution of elliptic passive scalar advection-diffusion equations is required in the analysis of many turbulent flow and convective heat transfer problems. The accuracy of the solution may be affected by the presence of regions containing large gradients of the dependent variables. The multigrid concept of local grid refinement is a method for improving the accuracy of the calculations in these problems. In combination with the multilevel acceleration techniques, an accurate and efficient computational procedure is developed. In addition, a robust implementation of the QUICK finite-difference scheme is described. Calculations of a test problem are presented to quantitatively demonstrate the advantages of the multilevel-multigrid method.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Numerical Heat Transfer (ISSN 0149-5720); 8; 1 19
    Format: text
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  • 3
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    Vibration of microgravity environment for rotating fluids in high and low rotating speeds (1989)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Time dependent evolutions of the profile of free surface (bubble shapes) for a cylindrical container partially filled with a Newtonian fluid of constant density, rotating about its axis of symmetry, have been studied. Numerical computations of the dynamics of bubble shapes have been carried out with the sinusoidal function vibration of gravity environment in high and low rotating cylinder speeds. The initial condition of bubble profiles was adopted from the steady-state formulations in which the computer algorithms have been developed by Hung and Leslie (1988), and Hung et al. (1988).
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: AIAA PAPER 89-0065
    Format: text
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  • 4
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    Dynamical behavior of surface tension on rotating fluids in low and microgravity environments (1989)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: Consideration is given to the time-dependent evolutions of the free surface profile (bubble shapes) of a cylindrical container, partially filled with a Newtonian fluid of constant density, rotating about its axis of symmetry in low and microgravity environments. The dynamics of the bubble shapes are calculated for four cases: linear time-dependent functions of spin-up and spin-down in low and microgravity, linear time-dependent functions of increasing and decreasing gravity at high and low rotating cylinder speeds, time-dependent step functions of spin-up and spin-down in low gravity, and sinusoidal function oscillation of the gravity environment in high and low rotating cylinder speeds. It is shown that the computer algorithms developed by Hung et al. (1988) may be used to simulate the profile of time-dependent bubble shapes under variations of centrifugal, capillary, and gravity forces.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Applied Microgravity Technology (ISSN 0931-9530); 2; 81-95
    Format: text
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  • 5
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    Time-dependent dynamical behavior of surface tension on rotating fluids under microgravity environment (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: Time dependent evolutions of the profile of free surface (bubble shapes) for a cylindrical container partially filled with a Newtonian fluid of constant density, rotating about its axis of symmetry, have been studied. Numerical computations of the dynamics of bubble shapes have been carried out with the following situations: (1) linear functions of spin-up and spin-down in low and microgravity environments, (2) step functions of spin-up and spin-down in a low gravity environment, and (3) sinusoidal function oscillation of gravity environment in high and low rotating cylinder speeds.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Advances in Space Research (ISSN 0273-1177); 8; 12 1
    Format: text
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  • 6
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    Effect of gravity level fluctuations for rotating fluids in high and low rotating speeds (1989)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Time-dependent evolutions of the profile of the free surface (bubble shapes) for a cylindrical container partially filled with a Newtonian fluid of constant density, rotating about its axis of symmetry, have been studied. Numerical computations of the dynamics of bubble shapes have been carried out with sinusoidal-function vibration of the gravity environment at high and low cylinder speeds.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: International Conference on Finite Element Methods in Flow Problems; Apr 03, 1989 - Apr 07, 1989; Huntsville, AL; United States
    Format: text
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  • 7
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    A multilevel-multigrid technique for recirculating flows (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: A solution algorithm has been developed for the prediction of recirculating flows. Brandt's multilevel acceleration technique is used with Leonard's QUICK differencing scheme and a modified pressure implicit operator splitting scheme. Intermediate calculations enable a tau error distribution to be used for the identification of regions for local grid refinement, i.e., multigrid. The algorithm was tested for the prediction of laminar flow in a shear-driven and a buoyancy-driven cavity.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Numerical Heat Transfer (ISSN 0149-5720); 8; 5 19
    Format: text
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  • 8
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    Experimental investigation of unsteady fan flow interaction with downstream struts (1987)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Journal of Propulsion and Power (ISSN 0748-4658); 3; 157-163
    Format: text
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  • 9
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    Experimental investigation of unsteady fan flow interaction with downstream struts (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: In the present study of the unsteady pressure field produced on fan rotor blades by interaction with downstream struts, a single stage, low speed axial-flow fan was instrumented with blade-mounted high frequency pressure transducers. In addition, stationary pressure problems were used to map out the flowfield. Fluctuating pressure measurements are presented for blade midspan and 85-percent span on both the suction and pressure surfaces of the rotor blades at several positions of the downstream struts, and for two different flow coefficients. The strut is found to produce an effect on the unsteady pressure field on the rotor blades; this effect exceeds that due to the stator at design rotor-stator-strut spacing, but it rapidly declines as the struts are moved downstream.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: AIAA PAPER 86-1870
    Format: text
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  • 10
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    Cryogenic Equivalence Principle Experiment (1985)
    In:  CASI
    Details
    Publikationsdatum: 2014-10-03
    Beschreibung: The purpose of this project is to test the equivalence of inertial and passive gravitational mass in an Earth-orbiting satellite. A ground-based experiment is now well developed. It consists of comparing the motions of two cylindrical test masses suspended in precision superconducting magnetic bearings and free to move along the horizontal (axis) direction. The masses are made of niobium and lead-plated aluminum. A position detector based on a SQUID magnetometer measures the differential motion between the masses. The periods of the masses are matched by adjustment of the position detector until the system is insensitive to common mode signals, and so that the experiment is less sensitive to seismic vibration. The apparatus is contained in a twelve inch helium dewar suspended in a vibration isolation stand. The stand achieves 30 db isolation from horizontal motions between 0.1 and 60 Hz, by simulating the motion of a 200 meter long pendulum with an air bearing. With this attenuation of seismic noise and a common mode rejection ratio of 10 to the 5th power in the differential mode, the ground based apparatus should have a sensitivity to equivalence principle violations of one part in 10 to the 13th power; the satellite version might have a sensitivity of one part in 10 to the 17th power.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA, Washington Microgravity Sci. and Appl. Program Tasks; p 196-197
    Format: text
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