May be you can have a look at this:

https://www.grc.nasa.gov/www/CEAWeb/

Which is initially designed for the thermodynamics and chemical equilibrium of rocket and expositions. Surely, it is not for a direct numerical simulation, but still may be helpful.

Are you concerned with detonation of a premixed mixture of fuel and oxidizer, or are you just interested in deflagration or similar ordinary combustion, limited, say, by convective transport of fuel and oxidizer? If detonation, do you want to actually follow the detonation process (i.e. the detonation wave front), or just the aftermath?

Hi Seyed,

OpenFOAM is an open c++ library for CFD simulation that you can use for explosion, however those code is fairly good in GNU/Linux. Another options can be Ansys-CFX or Ansys-Fluent, which are commercial codes. However, if the simulation is not so complicated as 3D model with complex turbulence models, you can write a python code for that.

Question is very broad...I suspect you want to simulate an accident of sorts, when a fireball forms and expands at supersonic speed ("explosion" is a technical term denoting a subsonic premixed combustion flame propagation...). A strictly supersonic problem is hyperbolic, so upwind schemes work relatively well. Any code capable of simulating unsteady supersonic flows will work. I have supervised supersonic simulations using FLUENT, so whay not using it?

One commercial software quite commonly used in Industry to simulate explosion is FLACS from Gexon.

Hi,

if if you are looking for a simple tool that does not solve for the complete flow equation, we have developed one tool for explosion in vented enclosures, the code is capable of calculating the pressure transients and the vented mass transients. for time being, the code can use hydroge, methane and propane as a fuel. We can extend it for more complex fuels as well. Article Methane-induced explosions in vented enclosures