scholarly journals Direct numerical simulation of reactor two-phase flows enabled by high-performance computing

2018 ◽  
Vol 330 ◽  
pp. 409-419 ◽  
Author(s):  
Jun Fang ◽  
Joseph J. Cambareri ◽  
Cameron S. Brown ◽  
Jinyong Feng ◽  
Andre Gouws ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
High Performance Computing ◽  
High Performance ◽  
Two Phase Flows ◽  
Two Phase ◽  
Performance Computing

On Direct Numerical Simulation of Turbulent Flows

2011 ◽  
Vol 64 (2) ◽  
Author(s):  
Giancarlo Alfonsi
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
High Performance Computing ◽  
Turbulent Flows ◽  
High Performance ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Turbulent Shear ◽  
Navier Stokes Equations ◽  
Performance Computing

The direct numerical simulation of turbulence (DNS) has become a method of outmost importance for the investigation of turbulence physics, and its relevance is constantly growing due to the increasing popularity of high-performance-computing techniques. In the present work, the DNS approach is discussed mainly with regard to turbulent shear flows of incompressible fluids with constant properties. A body of literature is reviewed, dealing with the numerical integration of the Navier-Stokes equations, results obtained from the simulations, and appropriate use of the numerical databases for a better understanding of turbulence physics. Overall, it appears that high-performance computing is the only way to advance in turbulence research through the front of the direct numerical simulation.

Direct numerical simulation of particle collisions in two-phase flows with a meshless method

2008 ◽  
Vol 63 (13) ◽  
pp. 3474-3484 ◽  
Author(s):  
Changfu You ◽  
Xi Wang ◽  
Haiying Qi ◽  
Ruichang Yang ◽  
Delong Xu
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Meshless Method ◽  
Particle Collisions ◽  
Two Phase Flows ◽  
Two Phase

Direct Numerical Simulation of Two Phase Flows in Liquid Cooled Engine Valves

2005 ◽  
Author(s):  
W. Sander ◽  
B. Weigand ◽  
C. Beerens
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
High Performance ◽  
Motor Vehicles ◽  
Stem Volume ◽  
Working Fluid ◽  
Two Phase ◽  
Internally Cooled ◽  
Pass Through ◽  
Fill Level

Future designs of combustion engines for motor-vehicles require modern high performance valves. Internally cooled valves have been used in engines for more than 90 years. Water was initially used as coolant and later mercury, but finally, after difficulties with these liquids, sodium was found to be an appropriate working fluid. The technique of using a liquid to carry the heat from the hot valve head to the valve stem, where it can pass through the valve guide, is now well established in industry. However, the design of such valves is mostly based on empirical knowledge within the industry. A simulation of the processes during the movement of the valve including detailed information about the highly transient two phase flow and the heat transfer in this system has not been realized so far. For this, an inhouse 3D DNS (direct numerical simulation) program (FS3D) was used to simulate the flow phenomena. The simulations have been performed on an equidistant rectangular computational grid in 2D. It was found that a typical fill level of sodium between 50% and 60% of the stem volume provides the best results for the averaged time evolution of the kinetic energy and also of the heat flux in the system. Furthermore, detailed descriptions of the realtime movement in the flow are shown for different fill levels. These results can be used to enhance and improve future designs.

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