Backward Euler | |
$ P^* $ | $ \left( \| p_h(T) \|^2 + \| {\bf q}_h(T) \|^2 \right)^{1/2} $ |
50 | 433.1920 |
51 | 913.7230 |
52 | 5.3532e+03 |
53 | 1.4410e+04 |
54 | 2.7783e+04 |
55 | 4.5390e+04 |
56 | 7.4976e+04 |
57 | 3.6508e+11 |
58 | 1.2408e+13 |
We study the qualitative behavior of a system of parabolic conservation laws, derived from a Keller-Segel type chemotaxis model with singular sensitivity, on the unit square or cube subject to various types of boundary conditions. It is shown that for given initial data in $H^3(\Omega)$, under the assumption that only the entropic energy associated with the initial data is small, there exist global-in-time classical solutions to the initial-boundary value problems of the model subject to the Neumann-Stress-free and Dirichlet-Stress-free type boundary conditions; these solutions converge to equilibrium states, determined from initial and/or boundary data, exponentially rapidly as time goes to infinity. In addition, it is shown that the solutions of the fully dissipative model converge to those of the corresponding partially dissipative model as the chemical diffusion rate tends to zero under the Neumann-Stress-free type boundary conditions. Numerical analysis is performed for a discretization of the model with the Dirichlet-Stress-free type boundary conditions, and a monotonic exponential decay to the equilibrium solution (analogous to the continuous case) is proven. Numerical simulations are supplemented to illustrate the exponential decay, test the assumptions of the exponential decay theorem, and to predict boundary layer formation under the Dirichlet-Stress-free type boundary conditions.
Citation: |
Figure 4. Shown above are solution plots for $ \varepsilon = 0.01 $ at varying times, for numerical experiment 4. Across the top row are contour plots of solutions $ p $, in the middle row are contours for $ | {\bf q}| $, and in the bottom row we show plots of $ p $ (left) and $ {\bf q}_2 $ (right) along $ x = 0 $
Table 1.
Values of energy norms at the end time
Backward Euler | |
$ P^* $ | $ \left( \| p_h(T) \|^2 + \| {\bf q}_h(T) \|^2 \right)^{1/2} $ |
50 | 433.1920 |
51 | 913.7230 |
52 | 5.3532e+03 |
53 | 1.4410e+04 |
54 | 2.7783e+04 |
55 | 4.5390e+04 |
56 | 7.4976e+04 |
57 | 3.6508e+11 |
58 | 1.2408e+13 |
Table 2.
Values of the critical
$ \Delta t $ | $ P^*_{critical} $ |
0.01 | 57 |
0.005 | 57 |
0.0025 | 64 |
0.00125 | 90 |
0.000625 | 91 |
0.0003125 | 90 |
0.00015625 | 90 |
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Shown above is decay in time of solution norms to Algorithm 5.1, with varying
Shown above are plots of solutions for
Shown above is a plot of
Shown above are solution plots for
Shown above are plots of