Preliminary tests of a hybrid numerical-asymptotic method for solving nonlinear advection-diffusion equations in a domain limited by a self-adjusting boundary
Deleersnijder, E.; Roland, M. (1993). Preliminary tests of a hybrid numerical-asymptotic method for solving nonlinear advection-diffusion equations in a domain limited by a self-adjusting boundary. Math. Comput. Model. 17(12): 35-47
In: Mathematical and Computer Modelling. Elsevier Science: Oxford. ISSN 0895-7177; e-ISSN 1872-9479, more
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| Keywords |
Equations
Equations > Nonlinear equations
Hybrids
Nonlinear
Tests
Transport processes > Advection
Transport processes > Diffusion
Marine/Coastal |
| Authors | | Top |
- Deleersnijder, E., more
- Roland, M.
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| Abstract |
An advection-diffusion equation is examined in which the diffusion coefficient is proportional to a positive power of the dependent variable, h. Because the diffusion coefficient is zero where h is zero, it is believed that the domain where h ? 0 expands at a finite velocity, u?, which must be calculated in an appropriate way if an accurate numerical solution technique is to be implemented. An asymptotic study leads to a local approximation of u?. The latter is then utilized in a finite volume solution of an axisymmetric problem where an exact solution can be obtained. The accuracy of the numerical results is excellent. Some peculiarities of the numerical solution are highlighted, and it is shown that they are due to the simplistic nature of the axisymmetric problem solved, which may be partly responsible for the high quality of the numerical results. Although the preliminary results are very encouraging, further testing of the method is needed, especially in fully two-dimensional cases. |
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