fix failing DGMultiMesh and Compressible Navier-Stokes convergence tests
#7298
| Job | Run time |
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| 41m 7s | |
| 33m 6s | |
| 51m 36s | |
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| 29m 41s | |
| 47m 1s | |
| 18m 24s | |
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| 43m 3s | |
| 47m 2s | |
| 21m 11s | |
| 30m 46s | |
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| 39m 24s | |
| 33m 54s | |
| 0s | |
| 14h 41m 7s |