Supersonic motions are common in molecular clouds. (Sub)sonic turbulence is usually detected toward dense cores and filaments. However, it remains unknown whether (sub)sonic at larger scales ($\gtrsim$1~pc) can be present different environments or not. Located a distance of about 110 pc, Ophiuchus North 1 (Oph N1) one the nearest clouds that allows in-depth investigation its properties by large...

Due to the wide application of Delaware nozzle in many fields, flow characteristics subsonic-supersonic isentropic De-Laval are analyzed numerically. The can be simplified a quasi-one-dimensional problem. First, MacCormack format is employed discretize control equations conservative form. Then, results with and without artificial viscosity compared. Grid independence also discussed. show that n...

In this paper, a unified method for the computation of unsteady aerodynamic forces in Laplace domain wing section subsonic, sonic and supersonic potential flows is presented. The subsonic solution new development based on pressure mode method. are evaluated by an efficient computing kernel. flow extension frequency to domain. Analytical expressions coefficient obtained regime. validated these r...