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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Flow in the nozzle with moving wall
 Foldyna, Josef ; Říha, Zdeněk ; Sitek, Libor
The paper presents simulation of 3D, unsteady, turbulent flow of water in the high-pressure nozzle device with moving wall. The wall performs rectilinear reciprocating motion with high frequency and very small amplitude that results in generation of very high velocity pulsations at the nozzle outlet. The pulsations lead to the break-up of continuous jet into regular slugs of water. The objective of the simulation was to verify whether dynamic meshes can be used to simulate above mentioned problem and satisfactory agreement of the simulation and reality can be obtained.
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Numerical simulation of the fire diffusion in mining passage
 Michalec, Zdeněk ; Kozubková, M. ; Bojko, M.
Numerical simulations of the stable stratified flow in a 3D passage affected by a thermal source have been calculated with a standard k-e model. Furthermore, the radiation heat transfer model is implemented and species transport equations are defined too. The model allows a correct stratification and produces fairly accurate heat wall transfer.
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