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Volume 25 (2006)
- Issue 6 Pages 507-
- Issue 5 Pages 455-
- Issue 4 Pages 311-
- Issue 3 Pages 181-
- Issue 2 Pages 93-
- Issue 1 Pages 4-
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Volume 25, Issue 5
Displaying 1-5 of 5 articles from this issue
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Hiroshi OKUMURA, Akira MARUOKA2006 Volume 25 Issue 5 Pages 455-463
Published: October 25, 2006
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSWe present a two-level finite element method (TLFEM) with triangle element enriched with residual-free bubble (RFB) functions for the Stokes equations. For approximating solutions of RFB in each triangle element, we propose an auxiliary problem with a corrector to stabilize the pressure field. Finally we discuss the numerical stability of RFB for diffusion dominated flows in the mixed variational problem through some numerical experiments.View full abstractDownload PDF (3947K) -
Yoichi UTANOHARA, Shigeo KIMURA, Takahiro KIWATA2006 Volume 25 Issue 5 Pages 465-476
Published: October 25, 2006
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSWe have studied the effect of mountain wave on the transport of Yellow Sand by 2-dimensional simulation. The advection-diffusion equation of scalar concentration is solved to simulate the transport of Yellow Sand. Two different models are employed, one is a one-layer model in which the density gradient is constant in the entire domain, and the other is a two-layer model in which the density gradient changes at 11 km altitude. In the both models the air parcel at a high altitude starts descending toward the ground behind the mountain as the atmospheric stability increases. In the two-layer model, trapped mountain waves become strong and rotors are also generated. The scalar concentration diffuses strongly in wave breaking and rotor regions. The ground scalar concentrations of the two-layer model are very large, compared with those by the one-layer model.View full abstractDownload PDF (3898K) -
Taro IMAMURA2006 Volume 25 Issue 5 Pages 477-484
Published: October 25, 2006
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSIn this study, acoustic propagation is computed based on lattice Boltzmann method (LBM). Linearized form of lattice Boltzmann equation (LBE) is used as a governing equation in order to capture the small acoustic perturbation. Additionally, implementations of farfield boundary condition and a monopole sound source are described in detail. The current code has a potential to solve acoustic propagation from non-compact body, including non-uniform mean flow effect and reflection at the wall. Several benchmark problems are solved, and current results show good agreement with the analytical results.View full abstractDownload PDF (7297K) -
Shin-ichi TAKEHIRO, Masatsugu ODAKA, Keiichi ISHIOKA, Masaki ISHIWATAR ...2006 Volume 25 Issue 5 Pages 485-486
Published: October 25, 2006
Released on J-STAGE: May 24, 2011
JOURNAL FREE ACCESSA series of spectral models which facilitate the execution of standard numerical experiments in geophysical fluid dynamics problems have been developed. Readability and modifiability of the program source codes are given priority in its design. The introduction of systematic function naming rules and the utilization of array-handling features enhanced by Fortran90 have permitted the program source codes to be written in a form that may be readily derived from the mathematical expressions of the original governing equations.View full abstractDownload PDF (329K) -
Challenge to the Two-Phase Turbulence Developing Particle Sizing TechniquesMasanobu MAEDA2006 Volume 25 Issue 5 Pages 487-498
Published: October 25, 2006
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSChapt.3 describes simultaneous measurement techniques of particle size and velocity with LDA system which contribute to the analysis on two-phase turbulence modification.View full abstractDownload PDF (7252K)
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