Browse Published Papers - Theoretical and Applied Mechanics (TAM) by Title

  • Asymptotic theory of ignition and failure of self-sustained detonations 
    Kasimov, Aslan R.; Stewart, D. Scott (Cambridge University Press, 2005)
    Based on a general theory of detonation waves with an embedded sonic locus that we have previously developed, we carry out asymptotic analysis of weakly curved slowly varying detonation waves and show that the theory ...

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  • Biaxial disclinated states in nematic elastomers 
    Fried, Eliot; Korchagin, Vladimir A.; Todres, Russell E. (American Institute of Physics, 2003-12-22)
    We use a continuum model to investigate the isochoric axial contraction and expansion of a right circular cylindrical specimen composed of a nematic elastomer that is cross-linked in a uniaxial state and then annealed. ...

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  • Effect of turbulence on the drag and lift of a particle 
    Bagchi, Prosenjit; Balachandar, S. (American Institute of Physics, 2003-11)
    A direct numerical simulation ~DNS! is used to study the effect of a freestream isotropic turbulent flow on the drag and lift forces on a spherical particle. The particle diameter is about 1.5–10 times the Kolmogorov ...

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  • Evolution of surface waviness in thin films via volume and surface diffusion 
    Panat, Rahul Padmakar; Hsia, K. Jimmy; Cahill, David G. (American Institute of Physics, 2005)
    Deformation mechanisms involving mass transport by stress driven diffusion influence a large number of technological problems. We study the formation of undulations on surfaces of stressed films at high temperature by ...

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  • Granular jets 
    Thoroddsen, Sigurdur T.; Shen, Amy Q. (American Institute of Physics, 2001-01)
    When a solid sphere impacts on a deep layer of granular medium, it generates an ejecta sheet and a transient axisymmetric crater. The gravity-driven radial collapse of this crater generates a pressure spike, as the cavity ...

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  • Incompatible strains associated with defects in nematic elastomers 
    Fried, Eliot; Sellers, Shaun (American Institute of Physics, 2006)
    In a nematic elastomer the deformation of the polymer network chains is coupled to the orientational order of the mesogenic groups. Statistical arguments have derived the so-called neoclassical free energy that models this ...

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  • Localized Turbulent Flows on Scouring Granular Beds 
    Gioia, Gustavo; Bombardelli, Fabian A. (American Physical Society, 2005)
    In many applications a sustained, localized turbulent flow scours a cohesionless granular bed to form a pothole. Here we use similarity methods to derive a theoretical formula for the equilibrium depth of the pothole. ...

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  • Locking of electric-field-induced non-180° domain switching and phase transition in ferroelectric materials upon cyclic electric fatigue 
    Liu, Ming; Hsia, K. Jimmy (American Institute of Physics, 2003)
    In situ x-ray diffraction measurements are conducted on a polycrystalline ferroelectric material lead-zironate-titanate-5H at different levels of static electric field. The locking of electric-field-induced non-180° ...

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  • Nonlinear oscillatory convection in rotating mushy layers 
    Riahi, Daniel N. (Cambridge University Press, 2006)
    We consider the problem of nonlinear oscillatory convection in a horizontal mushy layer rotating about a vertical axis. Under a near-eutectic approximation and the limit of large far-field temperature, we determine the ...

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  • On nonlinear convection in mushy layers. Part 1: Oscillatory modes of convection. With Corrigendums 
    Riahi, Daniel N. (Cambridge University Press, 2002)
    We consider the problem of nonlinear convection in horizontal mushy layers during the solidification of binary alloys. We analyse the oscillatory modes of convection in the form of two- and three-dimensional travelling ...

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  • On nonlinear convection in mushy layers. Part 2: Mixed oscillatory and stationary modes of convection 
    Riahi, Daniel N. (Cambridge University Press, 2004)
    This paper presents part 2 of a study of nonlinear convection in horizontal mushy layers during the solidification of binary alloys. Part 1 dealt with only the oscillatory modes of convection (Riahi, J. Fluid Mech. vol. ...

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  • On the dynamics of self-sustained one-dimensional detonations: A numerical study in the shock-attached frame 
    Kasimov, Aslan R.; Stewart, D. Scott (American Institute of Physics, 2004-10)
    In this work we investigate the dynamics of self-sustained detonation waves that have an embedded information boundary such that the dynamics is influenced only by a finite region adjacent to the lead shock. We introduce ...

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  • Population trends of spanwise vortices in wall turbulence 
    Wu, Yanhua; Christensen, Kenneth T. (Cambridge University Press, 2006)
    The present effort documents the population trends of prograde and retrograde spanwise vortex cores in wall turbulence outside the buffer layer. Large ensembles of instantaneous velocity fields are acquired by particle-image ...

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  • Radial Segregation Patterns in Rotating Granular Mixtures: Waviness Selection 
    Hill, Kimberly M.; Gioia, Gustavo; Amaravadi, Deepak R. (American Physical Society, 2004-11)
    We model the radial segregation patterns that form in a thin rotating drum partially filled with beads of two sizes. We predict that the waviness (or amplitude-to-wavelength ratio, denoted w) of a pattern should be subjected ...

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  • Residual stress effects on piezoelectric response of sol-gel derived lead zirconate titanate thin films 
    Berfield, Thomas A.; Ong, Ryan J.; Payne, David A.; Sottos, Nancy R. (American Institute of Physics, 2007)
    Piezoelectric properties of three sol-gel derived Pb(Zr0.53Ti0.47)O3 thin film specimens of different thicknesses integrated onto Pt/Ti/SiO2||Si substrates are investigated to delineate the influence of residual stress on ...

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  • Response of the wake of an isolated particle to isotropic turbulent cross-flow 
    Bagchi, Prosenjit; Balachandar, S. (Cambridge University Press, 2004)
    The interaction of an isolated spherical particle with an isotropic turbulent flow is considered using direct numerical simulations (DNS). The particle Reynolds number is varied from about 50 to 600 and the particle ...

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  • The role of coherent structures in subgrid-scale energy transfer within the log layer of wall turbulence 
    Natrajan, Vinay K.; Christensen, Kenneth T. (American Institute of Physics, 2006)
    The present effort documents the relationship between dominant subgrid-scale energy transfer events and coherent motions within the log layer of wall turbulence.

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  • Self-similarity theory of stationary coagulation 
    Pushkin, Dmitri O.; Aref, Hassan (American Institute of Physics, 2002)
    A theory of stationary particle size distributions in coagulating systems with particle injection at small sizes is constructed. The size distributions have the form of power laws. Under rather general assumptions, the ...

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  • Spanwise structure and scale growth in turbulent boundary layers 
    Tomkins, Christopher D.; Adrian, Ronald J. (Cambridge University Press, 2003)
    Spanwise structure and growth mechanisms in a turbulent boundary layer are investigated experimentally. PIV measurements are obtained in the streamwise– spanwise (x–z)-plane from the buffer layer to the top of the ...

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  • Spatial signatures of retrograde spanwise vortices in wall turbulence 
    Natrajan, Vinay K.; Wu, Yanhua; Christensen, Kenneth T. (Cambridge University Press, 2007)
    The spatial signatures of retrograde spanwise vortices in wall turbulence are assessed from particle-image velocimetry measurements in the streamwise–wall-normal plane of a zero-pressure-gradient turbulent boundary layer ...

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