Many questions that would be appropriate for this site would also be appropriate for mathoverflow, stackoverflow, and possibly other sites. What is the best practice for such questions to promote the growth of the newer computational science SE while still getting the greatest number of eyes on a question? Is their a standard convention for this between SE sites? Is it appropriate to cross-post a question verbatim to different sites?
In general you shouldn't cross-post: see this answer.
To get the biggest audience for your question:
- First post the question where you think it is most relevant.
- If you're not satisfied with the response, delete the question and re-ask it somewhere else, being sure to tailor the question to the new community.
Here is an alternative suggestion:
cross-posting an on-topic question is fine as long as:
- it is not simultaneous, and
- the OP has waited a reasonable time (a few days) without receiving a satisfying answer before posting it on another site, and
- the OP has provided links in both directions between the copies.
The OP should keep all copies up-to-date (e.g. if one copy is clarified based on the comments, the OP should clarify the other one also). Similarly, if she receives a satisfying answer on the other site she will post an answer linking to the full answer (or do better by posting a complete answer based on what she has leaned).
In the case that the cross-posting does not satisfy these conditions moderators will close the question as not-constructive and will explain the policy in a comment stating that the OP should wait a week and if she does not receive a satisfying answer by then she can flag the question for moderator attention and ask for the question to be reopened.
To add to Dan's answer: a moderator can migrate the question to another site for you if that is deemed appropriate.
You can request migration by flagging as "off-topic" and then suggesting (in the dialog box) a more appropriate SE site.