The method of combining incompressible hybrid Reynolds average Navier–Stokes/large eddy simulation (RANS/LES) with an acoustic perturbation equation was studied to accurately predict the flow and noise performances in NASA tandem cylinder experiments. In this approach, waves simultaneously propagate time domain unsteady turbulent flow. experiment performed under condition a number 1.66 × 105, b...

Aerodynamic noise becomes significant for high-speed trains but its prediction in an industrial context is difficult. The flow and aerodynamic noise behaviour of a simplified high-speed train bogie at scale 1:10 are studied here through numerical simulations. The bogie is situated in the bogie cavity and cases without and with a fairing are considered, allowing the shielding effect of the bogie...

An efficient finite volume approach has been used to develop a three dimensional Helmholtz acoustic solver for complex geometries. This acoustic solver was utilized to obtain characteristic mode shapes and frequencies of a baffled combustion chamber. An experimental setup, including stationary and moving sensors, has also been used to measure these quantities for the same model combustion chamb...

Although the Lighthill–Curle acoustic analogy theory is formally exact, presence of linear source terms related to viscous stresses and non-isentropic density changes makes it unsuitable for studying aerodynamic sound generation in low Reynolds number thermoviscous flows. Here we use an extension Ffowcs Williams Hawkings formulation, with effects explicitly included, find analytical solution ca...

The research paper considers the problem of teaching and learning foreign languages at time global pandemic. aim is to find a variant technology that prevents errors arising by false analogy with existing acoustic-graphic codes in “Language primary socialization” secondary improves students` knowledge, skills, abilities for authentic transformation information different national language code s...

Conceptual analogy (CA) is an approach, that integrates conceptualization based on prior experiences, i.e. case memory organization, and analogical reasoning (Borner and Janetzko 1995, Borner and Wode 1995). It was prototypically implemented and tested to support the design process in building engineering (B orner 1994a). This paper reviews the development of CA. It provides the basic assump...

The scalar mediation of the object through the space of representation ensures design methodologies based on similitude or procedural techniques must initially work upon appropriated forms. Given that translation ensures that these forms remain as a trace the architectural object is implicitly reliant on the application of analogy. While still bound to the act of drawing in, on or through the d...

Cognitive ability in solving analogy problems really needs the right information processing. The core cognitive process thinking occurs when students make a mapping between target problem and source problem. This research aims to describe analogical indirect based on processing theory. method usesd this is qualitative descriptive. subject study were third fifth-semester of Mathematics Tadris Pr...