## Computation of equations up to a prescribed accuracy with respect to singular terms and defect of differential equations.(English. Russian original)Zbl 1030.76041

Comput. Math. Math. Phys. 41, No. 10, 1489-1505 (2001); translation from Zh. Vychisl. Mat. Mat. Fiz. 41, No. 10, 1566-1582 (2001).
Boundary value problems for systems of differential equations with small coefficients of the highest order derivatives are considered in the following form $$U_t+F_x-\epsilon G_{xx}=0$$, $$\varepsilon\ll{1}$$. In the conventional approach, a solution is based on the construction of a grid that condenses in the regions where the terms containing $$\epsilon$$ are essential. The author obtains estimates for the smallest admissible value of a parameter corresponding to the required accuracy of singular term, for the order of accuracy, and for the number of grid points.

### MSC:

 76M20 Finite difference methods applied to problems in fluid mechanics 76N15 Gas dynamics (general theory)