TY - JOUR
T1 - Effects of polymers on the cavitating flow around a cylinder
T2 - A large-scale molecular dynamics analysis
AU - Asano, Yuta
AU - Watanabe, Hiroshi
AU - Noguchi, Hiroshi
N1 - Funding Information:
This research was supported by MEXT as “Exploratory Challenge on Post-K computer” (Challenge of Basic Science—Exploring Extremes through Multi-Physics and Multi-Scale Simulations) and JSPS KAKENHI, Grant Nos. JP15K05201 and 19H05718. We acknowledge the Supercomputer Center, Institute for Solid State Physics (ISSP), University of Tokyo; the Research Center for Computational Science (RCCS), Okazaki, Japan; and the Center for Computational Materials Science, Institute for Materials Research (IMR), Tohoku University, for the use of their supercomputers (Project No. 20S0026 for MASAMUNE-IMR in IMR).
Publisher Copyright:
© 2021 Author(s).
PY - 2021/7/7
Y1 - 2021/7/7
N2 - The cavitation flow of linear-polymer solutions around a cylinder is studied by performing a large-scale molecular dynamics simulation. The addition of polymer chains remarkably suppresses cavitation. The polymers are stretched into a linear shape near the cylinder and entrained in the vortex behind the cylinder. As the polymers stretch, the elongational viscosity increases, which suppresses the vortex formation. Furthermore, the polymers exhibit an entropic elasticity owing to stretching. This elastic energy increases the local temperature, which inhibits the cavitation inception. These effects of polymers result in the dramatic suppression of cavitation.
AB - The cavitation flow of linear-polymer solutions around a cylinder is studied by performing a large-scale molecular dynamics simulation. The addition of polymer chains remarkably suppresses cavitation. The polymers are stretched into a linear shape near the cylinder and entrained in the vortex behind the cylinder. As the polymers stretch, the elongational viscosity increases, which suppresses the vortex formation. Furthermore, the polymers exhibit an entropic elasticity owing to stretching. This elastic energy increases the local temperature, which inhibits the cavitation inception. These effects of polymers result in the dramatic suppression of cavitation.
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U2 - 10.1063/5.0056988
DO - 10.1063/5.0056988
M3 - Article
C2 - 34241403
AN - SCOPUS:85109209272
SN - 0021-9606
VL - 155
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 1
M1 - 014905
ER -