Why not just do Journal of Computational Physics or SIAM Journal on Scientific Computing? I recently submitted numerical work done with Julia to the latter and no one cares that it's Julia. In fact, with numerical work you could use whitespace and no one would care: it's all about the derivation of the method. The code that shows the derivation is correct. (Unless you mean numerical simulations, in that case, still people won't care about the code, just the results).
It will all come down to whether what you coded was novel and interesting or not.
