NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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different flow types are proposed. These filters provide a natural <strong>and</strong> efficient way for the minimization of the divergence of<br />
the magnetic field [divergence of B] numerical error in the sense that no st<strong>and</strong>ard divergence cleaning is required. For certain<br />
2-D MHD test problems, divergence free preservation of the magnetic fields of these filter schemes has been achieved.<br />
Author<br />
Magnetohydrodynamic Flow; Adaptive Control; Dissipation; Two Dimensional Flow; Multiscale Models<br />
20040070725 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
Semi-Empirical Modeling of SLD Physics<br />
Wright, William B.; Potapczuk, Mark G.; April 2004; 23 pp.; In English; 42nd <strong>Aerospace</strong> Sciences Meeting <strong>and</strong> Exhibit, 5-8<br />
Jan. 2004, Reno, NV, USA<br />
Contract(s)/Grant(s): WBS 22-728-41-17<br />
Report No.(s): <strong>NASA</strong>/TM-2004-212916; AIAA Paper 2004-0412; E-14352; No Copyright; Avail: CASI; A03, Hardcopy<br />
The effects of supercooled large droplets (SLD) in icing have been an area of much interest in recent years. As part of<br />
this effort, the assumptions used for ice accretion software have been reviewed. A literature search was performed to determine<br />
advances from other areas of research that could be readily incorporated. Experimental data in the SLD regime was also<br />
analyzed. A semi-empirical computational model is presented which incorporates first order physical effects of large droplet<br />
phenomena into icing software. This model has been added to the LEWICE software. Comparisons are then made to SLD<br />
experimental data that has been collected to date. Results will be presented for the comparison of water collection efficiency,<br />
ice shape <strong>and</strong> ice mass.<br />
Author<br />
Drop Size; Supercooling; Mathematical Models; Semiempirical Equations; Computer Programs; Fluid Dynamics<br />
20040070756 QSS Group, Inc., Clevel<strong>and</strong>, OH, USA<br />
An Evaluation of Jet Impingement Heat Transfer Correlations for Piccolo Tube Application<br />
Bond, Thomas, <strong>Technical</strong> Monitor; Wright, William B.; April 2004; 17 pp.; In English; 42nd <strong>Aerospace</strong> Sciences Meeting <strong>and</strong><br />
Exhibit, 5-8 Jan. 2004, Reno, NV, USA<br />
Contract(s)/Grant(s): NAG3-00145; WBS 22-728-41-17<br />
Report No.(s): <strong>NASA</strong>/CR-2004-212917; AIAA Paper 2004-0062; E-14355; No Copyright; Avail: CASI; A03, Hardcopy<br />
Impinging jets have been used for a wide variety of applications where high rates of heat transfer are desired. This report<br />
will present a review of heat transfer correlations that have been published. The correlations were then added to the LEWICE<br />
software to evaluate the applicability of these correlations to a piccolo tube anti-icing system. The results of this analysis were<br />
then compared quantitatively to test results on a representative piccolo tube system.<br />
Author<br />
Jet Impingement; Conductive Heat Transfer; Thermodynamics; Mathematical Models<br />
20040070765 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
Jet Noise Source Localization Using Linear Phased Array<br />
Agboola, Ferni A.; Bridges, James; April 2004; 18 pp.; In English<br />
Contract(s)/Grant(s): WBS 22-781-30-27<br />
Report No.(s): <strong>NASA</strong>/TM-2004-213041; E-14478; No Copyright; Avail: CASI; A03, Hardcopy<br />
A study was conducted to further clarify the interpretation <strong>and</strong> application of linear phased array microphone results, for<br />
localizing aeroacoustics sources in aircraft exhaust jet. Two model engine nozzles were tested at varying power cycles with<br />
the array setup parallel to the jet axis. The array position was varied as well to determine best location for the array. The results<br />
showed that it is possible to resolve jet noise sources with bypass <strong>and</strong> other components separation. The results also showed<br />
that a focused near field image provides more realistic noise source localization at low to mid frequencies.<br />
Author<br />
Jet Aircraft Noise; Linear Arrays; Phased Arrays; Aeroacoustics; Position (Location)<br />
20040070768 Lockheed Martin Corp., USA<br />
Software for Refining or Coarsening Computational Grids<br />
Daines, Russell; Woods, Jody; August 27, 2002; 1 pp.; In English<br />
Report No.(s): <strong>NASA</strong>/NP-2002-10-00035-SSC; SSC-00167-SM; No Copyright; Avail: CASI; A01, Hardcopy<br />
A computer program performs calculations for refinement or coarsening of computational grids of the type called<br />
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