DEVELOPMENT OF DROP/WALL INTERACTION MODEL FOR APPLICATION IN ENGINE CONDITIONS

2020 ◽  
Vol 30 (3) ◽  
pp. 153-170
Author(s):  
Yaoyu Pan ◽  
Xiufeng Yang ◽  
Song-Charng Kong ◽  
Chol-Bum M. Kweon
Keyword(s):  
Interaction Model ◽  
Wall Interaction

Effect of Spray-Wall Interaction On Thermoacoustic Instability Prediction by Flame Transfer Function and the Convective Time Delay Method

2021 ◽  
Author(s):  
Sheng Meng ◽  
Man Zhang
Keyword(s):  
Time Delay ◽  
Transfer Function ◽  
Numerical Models ◽  
Time Lag ◽  
Interaction Model ◽  
Phase Lag ◽  
Thermoacoustic Instability ◽  
Spray Flame ◽  
Wall Interaction ◽  
Definition Of

Abstract This study numerically investigates the effect of spray-wall interactions on thermoacoustic instability prediction. The LES-based flame transfer function (FTF) and the convective time delay methods are used by combining the Helmholtz acoustic solver to predict a single spray flame under the so-called slip and film spray-wall conditions. It is found that considering more realistic film liquid and a wall surface interaction model achieves a more accurate phase lag in both of the time lag evaluations compared to the experimental results. Additionally, the results show that a new time delay exists between the liquid film fluctuation and the unsteady heat release, which explains the larger phase value in the film spray-wall condition than in the slip condition. Moreover, the prediction capability of the FTF framework and the convective time delay methodology in the linear regime are also presented. In general, the instability frequency differences predicted using the FTF framework under the film condition are less than 10 Hz compared with the experimental data. However, an underestimation of the numerical gain value leads to requiring a change in the forcing position and an improvement in the numerical models. Due to the ambiguous definition of the gain value in the convective time delay method, this approach leads to arbitrary and uncertain thermoacoustic instability predictions.

On the Maxwell gas-wall interaction model for micro/nano gas flows

2012 ◽  
Author(s):  
Tengfei Liang ◽  
Qi Li ◽  
Wenjing Ye
Keyword(s):  
Interaction Model ◽  
Gas Flows ◽  
Wall Interaction ◽  
Maxwell Gas

Implementation of a Fuel Spray Wall Interaction Model in KIVA-II

1991 ◽  
Author(s):  
Leonard K. Shih ◽  
Dennis N. Assanis
Keyword(s):  
Interaction Model ◽  
Fuel Spray ◽  
Wall Interaction

Development of a new spray/wall interaction model

2000 ◽  
Vol 26 (7) ◽  
pp. 1209-1234 ◽  
Author(s):  
Seong Hyuk Lee ◽  
Hong Sun Ryou
Keyword(s):  
Interaction Model ◽  
Wall Interaction

scholarly journals Spray-Wall Interaction Model Considering Superheating Degree of the Wall Surface.

2000 ◽  
Vol 66 (642) ◽  
pp. 604-611 ◽  
Author(s):  
Jiro SENDA ◽  
Tomohiro TAKAHASHI ◽  
Tomoyuki TANAKA ◽  
Ki-Hyung Lee ◽  
Hajime FUJIMOTO
Keyword(s):  
Interaction Model ◽  
Wall Surface ◽  
Wall Interaction

A BIOMECHANICAL COMPARISON OF BLOOD FLOW AND MECHANICAL CHARACTERISTICS OF THE EARLY ARTERIOSCLEROTIC AND HEALTHY ARTERIES USING A FLUID-WALL INTERACTION MODEL

2014 ◽  
Vol 26 (02) ◽  
pp. 1450028
Author(s):  
Fan He
Keyword(s):  
Blood Flow ◽  
Flow Characteristics ◽  
Interaction Model ◽  
Cyclic Strain ◽  
Wall Stress ◽  
Strain Ratio ◽  
Shear Stresses ◽  
Stress And Deformation ◽  
Wall Interaction ◽  
Biomechanical Comparison

A fluid-wall interaction model was introduced to investigate and compare the properties of blood flow, wall stress and deformation of the early arteriosclerotic and healthy arteries. The unsteady blood flow was assumed to be laminar, Newtonian, viscous and incompressible. The vessel wall was assumed to be linear-elastic, isotropic and incompressible. The fluid-wall interaction algorithm was constructed using a finite element method. The results show that the blood flow, wall stress and strain distributions of both arteries are similar. The blood flow characteristics of the diseased artery are similar to those of the healthy artery, which may be the main reason that the early arteriosclerosis could be reversible and treated by itself. The values of velocities, wall shear stresses, pressures and wall stresses of the diseased artery are approximately equal to those of the healthy artery, however the values of wall strains of both arteries are different and the cyclic strain ratio of the diseased artery is higher than that of the healthy artery. A high cyclic strain ratio is thought to be disadvantageous for arterial tissue. A new parameter anti-fatigue index (AFI) is introduced to evaluate mechanical fatigue of artery in the study. AFI is effective in characterizing the anti-fatigue ability of artery.

Sign in / Sign up

Export Citation Format

Share Document