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Numerical simulation of gaseous detonation is one of the most challenging problems in computational fluid dynamics (i.e., CFD). The presence of sonic locus at the end of the reaction zone isolates the reaction zone and the leading shock from the far-field flow perturbations, so computational domain may be truncated by artificial boundary conditions. However, some artificial boundary conditions generate spurious waves that introduce some errors into the results. The computational domain is usually considered very large for protecting the domain from spurious waves. A systematic study of boundary conditions’ role in simulation of self-sustained detonation has not been performed yet. In the present study, it is aimed to investigate the influence of the width and length of the computational domain on numerical simulation and the effect of activation energy on the length and width of the domain. Instead of considering a very large domain, the so-called non-reflecting boundary condition is implemented in the present investigation. Characteristics method was employed to define the non-reflecting boundary conditions. Finite length of domain was computed for 1D and 2D simulations. Suitable length of the domain was determined for different activation energies. The results indicate that the suitable length and width of the domain for high activation energy mixtures are larger with respect to the corresponding length and width for low activation energy mixtures. Results also show that, using non-reflecting boundary condition, the computational time decreases considerably for both one and two-dimensional simulations.

Keywords: Gaseous Detonation, CJ point, Non-reflecting Boundary Condition, Characteristic Method, Truncating domain

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