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Is there really much value checking multiple solvers if you use the same pre-post which might introduce the same common errors, including user error, into all of them? I know it would be handy from time to time but validating solvers against each other seems like a small thing for an entire pre-post to be built around. It sounds a bit like compiling your software with multiple compilers to make sure it's correct. The bugs aren't usually in the compilers.

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I guess the thing is most people only use one solver, but at least when I was doing research it would be rare that two physics solvers based on different discretizations give exactly the same results (sometimes wildly different). So I would say, yes, its actually very valuable, although time consuming, and something most users don't really consider or think about (just because your physics solver converges doesn't necessarily mean the physics are represented accurately).

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