scholarly journals Validating a CFD Simulation Approach by Ventilation Measurements for an Air-Cooled Salient Pole Model Generator

2020 ◽  
Author(s):  
Bastian Diebel ◽  
Axel Walter-Krause ◽  
Roland Jester-Zuerker ◽  
Babette Schwarz
Keyword(s):  
Cfd Simulation ◽  
Pole Model ◽  
Simulation Approach ◽  
Salient Pole ◽  
Model Generator

CFD Simulation Approach for Semisubmersible Response in Waves Based on Advanced Techniques

2015 ◽  
Vol 772 ◽  
pp. 108-113 ◽  
Author(s):  
Ionuț Cristian Scurtu
Keyword(s):  
Cfd Simulation ◽  
Simulation Approach ◽  
Floating Structures ◽  
Sea Currents

All floating structures react different to sea currents and waves and the commonly asked question is how to understand, simplify and make distinction of structure according to the operational challenges. The main objective of this paper is to determine the response of a three column semisubmersible platform as used by WindFloat project with available CFD software: CFX and Fluent. The WindFloat created by PowerPrinciple is presented and the present study will consider only the semisubmersible.

A Comparison of 1D-3D Co-Simulation and Transient 3D Simulation for EGR Distribution Studies

2016 ◽  
Author(s):  
P. Dimitriou ◽  
C. Avola ◽  
R. Burke ◽  
C. Copeland ◽  
N. Turner
Keyword(s):  
Cfd Simulation ◽  
Simulation Software ◽  
Experimental Results ◽  
3D Simulation ◽  
Convergence Time ◽  
Simulation Approach ◽  
Mesh Quality ◽  
Time Step ◽  
1D Model ◽  
Simulation Time

Computational modeling, an important task for design, research and development stages, is evolving fast with the increase of computational capabilities over the last decades. One-dimensional (1D) CFD simulation is commonly used to analyze the flow rates and pressures of an entire fluid system of interconnected parts such as pipes, junctions, valves, and pumps. In contrast, three-dimensional (3D) CFD simulation allows detailed modeling of components such as manifolds, heat exchangers, and combustion cylinders where the flow contains significant 3D effects. Coupling a 1D model with a 3D domain potentially offers the benefits of both simulation strategies in one co-simulation approach. The present study provides a deep understanding of the co-simulation approach by listing all necessary steps need to be followed before and during the coupling of the 1D and 3D simulation software. It analyses the simulation and convergence time requirements based on the 3D model mesh quality and compares this approach with the current 1D–3D uncoupled approach followed in the industry. The outputs of both simulation approaches are then compared with experimental results. The co-simulation time mainly depends on the mesh quality of the 3D domain and the number of inner iterations per time-step which is entirely determined by the nature and complexity of the simulation. The co-simulation time per engine cycle is almost identical to the uncoupled approach. However, it was found that the number of cycles required for convergence in the coupled approach is nearly double than the uncoupled approach. The comparison between the two simulation approaches and the experimental results demonstrated the very 3D nature of the flows, the sensitivity of the uncoupled approach to input conditions and the sensitivity of co-simulation to the averaged boundary conditions transferred from the 1D model back to the 3D domain.

scholarly journals Computational fluid dynamics simulation of spray dryers: transient or steady state simulation?

2018 ◽  
Author(s):  
M. W. Woo ◽  
S. Afshar ◽  
H. Jubaer ◽  
B. Chen ◽  
J. Xiao ◽  
...  
Keyword(s):  
Steady State ◽  
Spray Drying ◽  
Cfd Simulation ◽  
Computation Time ◽  
Transient Simulation ◽  
Dynamics Simulation ◽  
Simulation Approach ◽  
Simulation Framework ◽  
Cfd Simulations ◽  
Steady State Simulation

Self-sustained fluctuating airflow behaviour in spray drying chambers is in essence an unsteady phenomenon requiring the transient CFD simulation framework. There is currently, however, a mixture of steady state and transient CFD simulations of spray dryers practised and reported in the literature. The choice between steady state and transient approach significantly affects the computation time of the simulation and subsequently the adoption of this approach by industry. This paper firstly examines in detail the bottleneck in computation time of the transient simulation approach. Based on past reports, this review paper then presents a discussion and provides several recommendations on the use of steady state and transient simulation approach for spray dryers. Keywords: CFD simulation, spray drying, transient, steady state, fluctuation 

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