نتایج جستجو برای: viscoelastic rans model

تعداد نتایج: 2114868  

Journal: :Neurourology and urodynamics 2006
Tim Idzenga Johan J M Pel Ron van Mastrigt

AIMS We aim at developing a non-invasive method for grading and diagnosing urinary bladder outlet obstruction, based on noise recording with a perineal contact microphone during voiding. We found that the noise production during voiding depends amongst others on the viscoelastic properties of the urethral wall. To further test our method, we need a realistic biophysical model of the male urethr...

Needle insertion is a minimally invasive technique in diagnosing and treating tumors. However, to perform a surgery accurately, the tissue should have minimum amount of displacement during needle insertion so that it reaches the target tissue. Therefore, the tissue membrane has to move less to decrease rupturing under the membrane. In this study, the effect of different design parameters on dis...

Journal: :Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention 2005
Jung Kim Mandayam A. Srinivasan

Soft tissue characterization and modeling based on living tissues has been investigated in order to provide a more realistic behavior in a virtual reality based surgical simulation. In this paper, we characterize the nonlinear viscoelastic properties of intra-abdominal organs using the data from in vivo animal experiments and inverse FE parameter estimation algorithm. In the assumptions of quas...

2014
Yuya Mikami Thomas Moulard Eiichi Yoshida Gentiane Venture

This paper describes the dynamics identification of the foot viscoelasticity of humanoid robots. It is important to know correctly dynamics parameters of link and joint which constitute a robot for its simulation and model based control. When walking, humanoids receive impulsive force at each step. Some humanoids have shock absorber and rubber bush in their soles. In simulation, accuracy of ine...

2002
R. Löhner George Mason

The present paper proposes a combination of the Baldwin Lomax and Smagorinsky turbulence models in order to compensate the de ciencies each one of these simple models exhibits. The proposed combination, named BLS, uses the turbulent viscosity of the Baldwin Lomax in the vicinity of walls, and a blend of Baldwin Lomax and Smagorinsky viscosity from the end of the inner layer (Baldwin Lomax) into...

Aliasghar Mohammadi, Hamid Mirzadeh, Mansooreh-Sadat Seyedkarimi, Shadab Bagheri-Khoulenjani,

Background: Self-assembling peptides (SApeptides) have growing applications in tissue engineering and regenerative medicine. The application of SApeptide-based hydrogels depends strongly on their viscoelastic properties. Optimizing the properties is of importance in tuning the characteristics of the hydrogels for a variety of applications. Methods: In this study, we employed statistical modelin...

1999
James R. Funk Gregory W. Hall Jeff R. Crandall Walter D. Pilkey

Prior mechanical testing of ankle ligaments has focused on quantifying ligament ultimate strength (Attarian et al., 1985; Siegler et al., 1988). Few studies have attempted to model the constitutive behavior of ankle ligaments at sub-failure levels. Although the viscoelastic nature of ankle ligaments has been noted (Attarian et al., 1985), no studies have attempted to create a viscoelastic const...

2014
Z Zheng R Zhang

Glass relaxation occurs in a range of temperature during transition from equilibrium to super-cooled liquid. Viscoelastic material model can be applied to simulate glass behavior in the glass transition regime. COMSOL Multiphysics software 4.3b can simulate the stress relaxation with the WLF (WilliamsLandel-Ferry) shift function, but no structural relaxation. In this study we developed a framew...

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