TY - JOUR
T1 - Implementation of pseudo-turbulence closures in an Eulerian–Eulerian two-fluid model for non-isothermal gas–solid flow
AU - Peng, C.
AU - Kong, B.
AU - Zhou, J.
AU - Sun, B.
AU - Passalacqua, A.
AU - Subramaniam, S.
AU - Fox, R. O.
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/11/2
Y1 - 2019/11/2
N2 - The Eulerian–Eulerian two-fluid model is widely used for computational fluid dynamics simulations of gas–solid flows. For non-isothermal flows, the averaged conservation equations solved in the two-fluid model require closures for drag, gas–solid heat transfer, pseudo-turbulent velocity fluctuations and the pseudo-turbulent heat flux (PTHF). However, the pseudo-turbulence terms are usually neglected in two-fluid simulations due to the lack of accurate correlations. With the increase in computational power, closures for these terms are now available from particle-resolved direct-numerical simulation (PR-DNS). Here, the PTHF closure as well as the heat-transfer closure (i.e., the Nusselt number) extracted from PR-DNS are implemented in the two-fluid thermal energy equation in OpenFOAM. The implementation is validated by comparing the simulation results with the PR-DNS data for the temperature profiles. Based on the analysis of the thermal energy budget, the PTHF can have a significant contribution and neglecting it can lead to large errors.
AB - The Eulerian–Eulerian two-fluid model is widely used for computational fluid dynamics simulations of gas–solid flows. For non-isothermal flows, the averaged conservation equations solved in the two-fluid model require closures for drag, gas–solid heat transfer, pseudo-turbulent velocity fluctuations and the pseudo-turbulent heat flux (PTHF). However, the pseudo-turbulence terms are usually neglected in two-fluid simulations due to the lack of accurate correlations. With the increase in computational power, closures for these terms are now available from particle-resolved direct-numerical simulation (PR-DNS). Here, the PTHF closure as well as the heat-transfer closure (i.e., the Nusselt number) extracted from PR-DNS are implemented in the two-fluid thermal energy equation in OpenFOAM. The implementation is validated by comparing the simulation results with the PR-DNS data for the temperature profiles. Based on the analysis of the thermal energy budget, the PTHF can have a significant contribution and neglecting it can lead to large errors.
KW - Computational fluid dynamics
KW - Gas–solid flow
KW - Pseudo-turbulent heat flux
KW - Two-fluid model
UR - http://www.scopus.com/inward/record.url?scp=85068442386&partnerID=8YFLogxK
U2 - 10.1016/j.ces.2019.06.054
DO - 10.1016/j.ces.2019.06.054
M3 - 文章
AN - SCOPUS:85068442386
SN - 0009-2509
VL - 207
SP - 663
EP - 671
JO - Chemical Engineering Science
JF - Chemical Engineering Science
ER -