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Noisy nonlinear dynamics of vesicles in flow
1II. Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart, Germany.
Physical Review Letters
|August 29, 2014
Summary
We developed a model for fluid vesicle dynamics in flow, revealing a novel "trembling" motion at a critical transition point. This explains how thermal noise amplifies, leading to asymmetric shapes not predicted by deterministic models.
Area of Science:
- Physics
- Biophysics
- Fluid Dynamics
Background:
- Fluid vesicles are microscopic structures with complex dynamics in flow.
- Existing models often neglect thermal fluctuations and nonlinear couplings.
- Understanding vesicle behavior is crucial for cell mechanics and drug delivery.
Purpose of the Study:
- To develop a comprehensive model for fluid vesicle dynamics in linear flow.
- To investigate the role of thermal fluctuations and nonlinear mode coupling.
- To explain anomalous vesicle behavior observed in recent experiments.
Main Methods:
- Developed a theoretical model incorporating thermal fluctuations.
- Analyzed nonlinear coupling between different dynamic modes.
- Simulated vesicle behavior at the transition between tank treading and tumbling.
Main Results:
- Predicted a novel
- trembling
- motion at the tank treading-tumbling transition.
- Demonstrated strong amplification of thermal noise in this regime.
- Observed highly asymmetric vesicle shapes, contradicting deterministic predictions.
Conclusions:
- The model quantitatively explains recent experimental findings on vesicle dynamics.
- Thermal fluctuations play a critical role in vesicle shape transitions.
- The predicted trembling motion offers new insights into microfluidic behavior.
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