Showing 1 - 10 of 12
An ordinary differential equation (ODE) form of the radial return algorithm, which is essentially a Prandtl-Reuss material model, is combined with a strain-rate hardening model to produce an ODE that describes deviatoric stress through a prescribed density rise. An analytical solution is found...
Persistent link: https://www.econbiz.de/10011264187
Lattice Boltzmann numerical simulations were performed to obtain the drag force on 3D fractal objects. The hydrodynamic radius Rh was calculated and compared with the radius of gyration Rg for a series of fractal aggregates to get an insight in to the role of the aggregate size and fractal...
Persistent link: https://www.econbiz.de/10011050493
We construct a discrete model for a particular PDE having nonlinear advection, diffusion, and reaction. The use of the …
Persistent link: https://www.econbiz.de/10010870051
A continuous-time predator–prey model without spatial variation is proposed to study the impact of Allee effects upon the predator–prey interaction when the prey population is subject to Allee effects. The system exhibits a threshold below which both populations become extinct. The model...
Persistent link: https://www.econbiz.de/10010906726
We present a method for computer simulation of diffusion. The method uses quasi-random walk of particles. We consider a … pure initial value problem for a simple diffusion equation in s space dimensions. We introduce s spatial steps Δxi. A semi …
Persistent link: https://www.econbiz.de/10011050578
In this paper a scheme for approximating solutions of convection–diffusion–reaction equations by Markov jump processes … automatically the time adaptivity and, in one space dimension, stable approximations of diffusion operators on non-uniform grids and …
Persistent link: https://www.econbiz.de/10011050631
for computing the diffusion coefficients for post-discharge nitriding. The method is based upon an inverse problem of … coefficient identification. The related moving boundary diffusion problem is modeled assuming constant diffusion coefficients and … the identification of the diffusion coefficients the solution of the least square problem is transformed, with some …
Persistent link: https://www.econbiz.de/10011050687
The solution of the diffusion equation at the non-stationary boundary represents the so-called Stefan problem which can … be solved by means of the thermal potential of a double-layer with the accuracy sufficient for description of diffusion … boundary shift and diffusivity in the diffusion joints can be determined very precisely from the areas below and above the …
Persistent link: https://www.econbiz.de/10011051031
the soil using the techniques of mathematical modeling and computer simulation. The effects of granule radius, diffusion …
Persistent link: https://www.econbiz.de/10010748814
bistable chemical reaction-diffusion system which also displays Turing and Hopf instabilities. The Turing bifurcation curve and …
Persistent link: https://www.econbiz.de/10010748939