Archive for the 'LS-DYNA SPH' Category

Smoothing Length in SPH

Published by Suri Bala May 31st, 2007 in LS-DYNA SPH. 4 Comments

Update James Kennedy reported a minor print error with regards to default smoothing length calculation. This has been corrected. Thanks James. In Smoothed Particle Hydrodynamics (SPH), the particles not only pocess time-history variables such as density, displacement, velocity, acceleration, strrain-rate, stress-rate, etc but they also act as interpolation points. The space and time dependent variable [...]

Viscous Damping Coefficient (VDC) in SPH Contact

Published by Suri Bala May 30th, 2007 in LS-DYNA Contact and LS-DYNA SPH. 1 Comment

Viscous Daming Coefficient (VDC) is freqeuntly used in contact interface definitions (*CONTACT) to damp out oscillations normal to the contact segment. It is specified in percentage of the critical damping where a value of 90 is 90% of critical damping. In one recent applications using SPH for gravity initialization of a filled fluid container, using [...]

SPH Contact Definitions

Published by Suri Bala April 14th, 2007 in LS-DYNA Bytes, LS-DYNA Contact and LS-DYNA SPH. 2 Comments

SPH is now widely used in several high strain-rate and large-deformation problems which may otherwise be difficult to simulate when using traditional mesh based approaches. LS-DYNA allows mesh-based and mesh-free techniques such as SPH to exist and interact in one simulation allowing users to take advantage of both procedures. The interaction or coupling between the [...]

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