The recent paper has been published on Physics of Fluids with a following title:
"Diffusion of turbulence following both stable and unstable step stratification perturbations"
Physics of Fluids (2022); https://doi.org/10.1063/5.0090042
Luca Gallana, Shahbozbek Abdunabiev, Mina Golshan, Daniela Tordella
The evolution of a two-phase, air and unsaturated water vapor, time decaying, shearless, turbulent layer has been studied in the presence of both stable and unstable perturbations of the normal temperature lapse rate. The top interface between a warm vapor cloud and clear air in the absence of water droplets was considered as the reference dynamics. Direct, three dimensional, numerical simulations were performed within a 6m x 6m wide and 12m high domain, which was hypothesized to be located close to an interface between the warm cloud and clear air. The Taylor micro-scale Reynolds’ number was 250 inside the cloud portion. The squared Froude’s number varied over intervals of [0.4; 981.6] and [-4.0; -19.6]. A sufficiently intense stratification was observed to change the mixing dynamics. The formation of a sub layer inside the shearless layer was observed. The sub-layer, under a stable thermal stratification condition, behaved like a pit of kinetic energy. However, it was observed that kinetic energy transient growth took place under unstable conditions, which led to the formation of an energy peak just below the center of the shearless layer. The scaling law of the energy time variation inside the interface region was quantified: this is an algebraic law with an exponent that depends on the perturbation stratification intensity. The presence of an unstable stratification increased the differences in statistical behavior among the longitudinal velocity derivatives, compared with the unstratified case. Since the mixing process is suppressed in stable cases, small-scale anisotropy is also suppressed.
Born in Tabriz, IRAN, I speak Azeri, Turkish, Persian, English, and a little bit of Italian. I am an international swimmer and I have the third degree of swimming coach and I also have black belt in karate. I really enjoy teaching people, which is something that I have pursued throughout my life.
As a primary student I felt great passion towards experimental sciences like Physics and Chemistry, which caused me to dedicate a lot of my time to these experimental activities. During these years physics was the subject where most of my interest lied. Therefore, I got more and more motivated to enroll to the department of atomic physics in the most competitive universities. I have a background in Physics with a master thesis in the field of fundamental physics (New Potential with the Oscillator Spectrum). My previous work experience was in the Coherent state theory, Non-linear system and coherent related state, Electro optic effects and electro absorption process. In addition, I have a great passion for physics of the atmosphere or environmental physics, chaotic systems or turbulence, fluid dynamics or statistical mechanics to name but a few.
And finally, I am writing this comment tab being in Turin, Italy. I got an opportunity to pursue PhD studies in Cloud Physics at Politecnico di Torino as a researcher in the COMPLETE project. I will do my best and I will dedicate my time and energy to make this experience a very valuable one.
Email: mina.golshan@polito.it