COMPUTER FLUID DYNAMICS DETERMINATION OF INSIDE FLUID RESERVOIRS MOVEMENTS AND WALLS LOADS DURING EARTHQUAKES

Autor/autori: Lecturer Eng. Ioan Sorin LEOVEANU, PhD.

Rezumat: Rezervoarele sunt constructii destinate depozitarii unei mari varietati de fluide, gaze lichefiate sau diverse gaze. In timpul proceselor de umplere, golire sau in cazul unui cutremur lichidele stocate in acestea vor dezvolta un sistem de incarcari dinamice care poate afecta integritatea structurii. Lucrarea propusa are ca scop utilizarea analizei numerice bazate pe calculul dinamicii fluidului (CFD) pentru a determina dinamica presiunii exercitate de fluid asupra rezervoarelor in timpul manevrarii acestora. In lucrare s-a pus un accent deosebit pe efectul unei miscari seismice avand caracteristicile marilor cutremure din Vrancea, accelerogramele fiind ale ultimului mare cutremur. Se considera ca sistemul de forte distribuite produse de miscarea fluidului este format din forte distribuite normale pe suprafata in contact cu fluidul (presiune impulsiva) si dintr-un sistem de presiuni distribuite tangential pe suptafata de contact (presiune convectiva). Lucrarea isi propune sa puna in evidenta complexitatea unor astfel de probleme.

Cuvinte cheie: dinamica fluidului, cutremur, rezervoare, sistem de forte, sarcina structurala


Abstract: Ground-supported reservoirs are used for a large variety of fluids and liquefied gases storages. During the processes of filling, empting and other exterior exceptional conditions the liquid develop a particular system of dynamic loading that can affect the integrity of the structure. The present papers consider a CFD analysis for establishing that effects of loading history of fluids that can take place on the walls of the reservoirs in the conditions of filling, empting and in the earthquake time. The pressure distribution on the walls is transformed in normal pressure (impulsive pressure) and in the tangent pressure with the walls (convective pressure) and applied to the structure of the reservoir. The verifications of the mathematical modeling were done using the acceleration spectra specifically to an earthquake with 7.4 magnitudes on Richter scale acting on both directions. This paper provides theoretical background for investigation of hydrodynamic pressure that is being developing during an earthquake in the liquid storage ground-supported rectangular container.

Keywords: computer fluid dynamics, earthquake, reservoirs, loading system, structural loading

 

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