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

  • 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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  • Panat, Rahul P.; 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Kasimov, Aslan R.; Stewart, D. Scott (Cambridge University Press, 2002)
    We investigate hydrodynamic instability of a steady planar detonation wave propagating in a circular tube to three-dimensional linear perturbations, using the normal mode approach. Spinning instability is identified and ...

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  • Hill, Kimberly M.; Gioia, Gustavo; Tota, Vinay V. (American Physical Society, 2003)
    We show that the structure of a dense, free-surface boundary layer granular flow is similar to the structure of a laminar liquid flow: There is a strong component of order (stratification parallel to the mean flow) ...

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