The unstable flow with rotating-stall-like (RS) effects in a rotor-cascade of an axial compressor was numerically investigated. The RS was captured with the reduction in mass flow rate and increasing of exit static pressure with respect to design operating condition of the single rotor. The oscillatory velocity traces during the stall propagation showed that the RS vortices repeat periodically,...

The unstable flow with rotating-stall-like (RS) effects in a rotor-cascade of an axialcompressor was numerically investigated. The RS was captured with the reduction in mass flow rateand increasing of exit static pressure with respect to design operating condition of the single rotor.The oscillatory velocity traces during the stall propagation showed that the RS vortices repeatperiodically, and...

An unsteady two-dimensional finite-volume solver was developed based on Van Leer’s flux splitting algorithm in conjunction with “Monotonic Upstream Scheme for Conservation Laws (MUSCL)” limiters to improve the order of accuracy and the two-layer Baldwin-Lomax turbulence model was also implemented. Two test cases were prepared to validate the solver. The computed results were compared with the e...

A family of moment-conserving advection schemes in 1-D was introduced by van Leer in the mid 1970s. Of these, MUSCL advection is the best known. That advection scheme represents the advected function, which we will call a , by a linear function within each grid cell. The linear function is determined by the values of the first two moments of this density distribution within the cell, namely the...

Johannes Walaeus. Zijn betekenis vor de verbreiding van de leer van de bloeds omloop [Johannes Walaeus. His significance in the recognition of the doctrine of blood circulation], by J. SCHOUTEN, Assen, Van Gorcum, 1972, pp. viii, 260, illus., Dfl. 46. Reviewed by Walter Pagel, 58 Millway, London, NW7 3RA. Walaeus [Jan de Wale] (1604-1649) was the first to confirm and amplify by original experim...

An approximate Riemann solver of Godunov type for ideal relativistic magnetohydrodynamic equations (RMHD) named as HLLC (“C” denotes contact) is developed. In HLLC the Riemann fan is approximated by two intermediate states, which are separated by the entropy wave. Numerical tests show that HLLC resolves contact discontinuity more accurately than the Harten-Lax-van Leer (HLL) method and an isola...

D.S. McKay, S.J. Clemett, K.L. Thomas-Keprta, S.J. Wentworth, E.K. Gibson, Jr, F. Robert, A.B. Verchovsky, C.T.Pillinger, T. Rice, B. Van Leer; Astrobiology Group, KA/ARES, NASA-JSC, Houston, TX 77058; Astrobiology Group, ESCG, JE23, Johnson Space Center, Houston, TX 77058; Museum D’Histoire Naturelle, Paris, France; PSSRI, The Open University, Milton Keynes, MK7 6AA, UK; FEI Company, Hillsboro...

Die hoofdoelstellings van ’n diens aan die geestesvertraagde is rehabilitasie in die gemeenskap, of die bereiking van maksimale persoonlike en sosiale onafhanklikheid binne die omgewing van ’n sorgen rehabilitasiesentrum. Daarom moet die verpleegkundige opgelei word om in die normale (of primêre) menslike sowel as die buitengewone behoeftes van die geestesvertraagde te voorsien. Voorbereiding m...

Goeie kommunikasie is die hoeksteen van die verpleegberoep. Aan die hand van gevalle illustreer die skrywer dat die kind veral gevoelig is vir ’n gebrek aan kommunikasie en dat 'n spesiale poging dus aangewend moet word. Hospitalisasie en veral die skeiding van sy moeder het ’n intense invloed op die kind en sy reaksies hang van verskeie faktore af. Om te voorkom dat die hospitaalervaring horn ...