نتایج جستجو برای: سیال fene p

تعداد نتایج: 1277082  

Journal: :Physical review letters 2007
Dario Vincenzi Shi Jin Eberhard Bodenschatz Lance R Collins

We present a new closure for the mean rate of stretching of a dissolved polymer by homogeneous isotropic turbulence. The polymer is modeled by a bead-spring-type model (e.g., Oldroyd B, FENE-P, Giesekus) and the analytical closure is obtained assuming the Lagrangian velocity gradient can be modeled as a Gaussian, white-noise stochastic process. The resulting closure for the mean stretching depe...

2008
Qiang Du

In this talk, we present some joint work with current and former colleagues at Penn State (C. Liu, P. Yu and Y. Hyon) on moment closure approximations of multiscale complex fluid models. Moment closure not only provides a computationally feasible approach to simulate many multiscale phenomena but also offers insight to the understanding of the underlying physical processes. We will discuss some...

Journal: :The Journal of biological chemistry 2007
Cheng-Yeu Wu Chyi-Liang Chen Yu-Hsiu Lee Yu-Chieh Cheng Ying-Chung Wu Hung-Yu Shu Friedrich Götz Shih-Tung Liu

Fengycin, a lipopeptidic antibiotic, is synthesized nonribosomally by five fengycin synthetases (FenC, FenD, FenE, FenA, and FenB) in Bacillus subtilis F29-3. This work demonstrates that these fengycin synthetases interlock to form a chain, which coils into a 14.5-nm structure. In this chain, fengycin synthetases are linked in the order FenC-FenD-FenE-FenA-FenB by interactions between the C-ter...

2011
David Richter Eric S. G. Shaqfeh Gianluca Iaccarino

Using a code developed to compute high Reynolds number viscoelastic flows, polymer injection from the upstream stagnation point of a circular cylinder is modeled at Re 1⁄4 3900. Polymer stresses are represented using the FENE-P constitutive equations. By increasing polymer injection rates within realistic ranges, significant near wake stabilization is observed. Rather than a turbulent detached ...

2014
M. K. Sing Z. Wang G. H. McKinley B. D. Olsen

System parameters and steady-state convergence criteria For purposes of this work, a mesh size of was used. Steady state equilibrium was determined using the less stringent of the two error criteria as defined below: \* MERGEFORMAT (1) \* MERGEFORMAT (2) The time step used was determined using the maximum value of the FENE force relative to the spatial discretization and rounded for convenience...

Journal: :Mathematics and Computers in Simulation 2021

We investigate finite amplitude stability of spatially inhomogeneous steady state an incompressible viscoelastic fluid which occupies a mechanically isolated vessel with walls kept at non-uniform temperature. For wide class models including the Oldroyd-B model, Giesekus FENE-P Johnson–Segalman and Phan–Thien–Tanner model we prove that is stable subject to any perturbation.

Journal: :Journal of Differential Equations 2021

In this paper we mainly investigate the inviscid limit for strong solutions of finite extensible nonlinear elastic (FENE) dumbbell model. By virtue Littlewood-Paley theory, first obtain a uniform estimate solution to FENE model with viscosity in Besov spaces. Moreover, show that data-to-solution map is continuous. Finally, prove converges Euler system couple Fokker-Planck equation. Furthermore,...

2003
X. Ma V. Symeonidis G. E. Karniadakis

A new method for stabilizing viscoelastic flows is proposed suitable for high-order discretizations. It employs a mode-dependent diffusion operator that guarantees monotonicity while maintaining the formal accuracy of the discretization. Other features of the method are: a high-order time-splitting scheme, modal spectral element expansions on a single grid, and the use of a finitely extensible ...

2012
NADER MASMOUDI

Abstract Systems coupling fluids and polymers are of great interest in many branches of sciences. One of the most classical models to describe them is the FENE (Finite Extensible Nonlinear Elastic) dumbbell model. We prove global existence of weak solutions to the FENE dumbbell model of polymeric flows. The main difficulty is the passage to the limit in a nonlinear term that has no obvious comp...

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