Volume 7, Issue 2
Numerical Investigation of Tumbling Phenomena Based on a Macroscopic Model for Hydrodynamic Nematic Liquid Crystals

Hui Zhang & Qichuan Bai

Commun. Comput. Phys., 7 (2010), pp. 317-332.

Published online: 2010-02

Preview Full PDF 148 1296
Export citation
  • Abstract

This paper is concerned with the numerical investigation of a macroscopic model for complex fluids in “1+2” dimension case. We consider the planar pressure driven flow where the direction of the molecules is constrained in the shear plane. The modified Crank-Nicolson finite difference scheme satisfying a discrete energy law will be developed. By using this scheme, it is observed numerically that the direction of the molecules will tumble from the boundary layer and later on the inner layer with a much longer time period. This is consistent with the theoretical prediction. Moreover, we find some complex phenomena, where the tumbling rises from boundary layer and is then embedded into the interior area more clearly when the viscosity coefficient µ of the macro flow has a larger value. The norm of the molecular director d will endure greater change as well. This implies that the viscosity of flow plays the role of an accelerator in the whole complex fluids. Comparing these results with the theoretical analysis, we can find that the gradient of the velocity has direct impact on the tumbling phenomena. These results show that the proposed scheme is capable of exploring some physical phenomena embedded in the macro-micro model.

  • Keywords

  • AMS Subject Headings

  • Copyright

COPYRIGHT: © Global Science Press

  • Email address
  • BibTex
  • RIS
  • TXT
@Article{CiCP-7-317, author = {}, title = {Numerical Investigation of Tumbling Phenomena Based on a Macroscopic Model for Hydrodynamic Nematic Liquid Crystals}, journal = {Communications in Computational Physics}, year = {2010}, volume = {7}, number = {2}, pages = {317--332}, abstract = {

This paper is concerned with the numerical investigation of a macroscopic model for complex fluids in “1+2” dimension case. We consider the planar pressure driven flow where the direction of the molecules is constrained in the shear plane. The modified Crank-Nicolson finite difference scheme satisfying a discrete energy law will be developed. By using this scheme, it is observed numerically that the direction of the molecules will tumble from the boundary layer and later on the inner layer with a much longer time period. This is consistent with the theoretical prediction. Moreover, we find some complex phenomena, where the tumbling rises from boundary layer and is then embedded into the interior area more clearly when the viscosity coefficient µ of the macro flow has a larger value. The norm of the molecular director d will endure greater change as well. This implies that the viscosity of flow plays the role of an accelerator in the whole complex fluids. Comparing these results with the theoretical analysis, we can find that the gradient of the velocity has direct impact on the tumbling phenomena. These results show that the proposed scheme is capable of exploring some physical phenomena embedded in the macro-micro model.

}, issn = {1991-7120}, doi = {https://doi.org/10.4208/cicp.2009.08.206}, url = {http://global-sci.org/intro/article_detail/cicp/7631.html} }
TY - JOUR T1 - Numerical Investigation of Tumbling Phenomena Based on a Macroscopic Model for Hydrodynamic Nematic Liquid Crystals JO - Communications in Computational Physics VL - 2 SP - 317 EP - 332 PY - 2010 DA - 2010/02 SN - 7 DO - http://doi.org/10.4208/cicp.2009.08.206 UR - https://global-sci.org/intro/article_detail/cicp/7631.html KW - AB -

This paper is concerned with the numerical investigation of a macroscopic model for complex fluids in “1+2” dimension case. We consider the planar pressure driven flow where the direction of the molecules is constrained in the shear plane. The modified Crank-Nicolson finite difference scheme satisfying a discrete energy law will be developed. By using this scheme, it is observed numerically that the direction of the molecules will tumble from the boundary layer and later on the inner layer with a much longer time period. This is consistent with the theoretical prediction. Moreover, we find some complex phenomena, where the tumbling rises from boundary layer and is then embedded into the interior area more clearly when the viscosity coefficient µ of the macro flow has a larger value. The norm of the molecular director d will endure greater change as well. This implies that the viscosity of flow plays the role of an accelerator in the whole complex fluids. Comparing these results with the theoretical analysis, we can find that the gradient of the velocity has direct impact on the tumbling phenomena. These results show that the proposed scheme is capable of exploring some physical phenomena embedded in the macro-micro model.

Hui Zhang & Qichuan Bai. (2020). Numerical Investigation of Tumbling Phenomena Based on a Macroscopic Model for Hydrodynamic Nematic Liquid Crystals. Communications in Computational Physics. 7 (2). 317-332. doi:10.4208/cicp.2009.08.206
Copy to clipboard
The citation has been copied to your clipboard