Corrections for uninitialised fields in d3q27_pf_velocity

[llaniewski]

This fixes the problem of uninitialised values in the InitFromFieldsStage stage.

@shkodm Could you make it a priority to test if this doesn't break your computations?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9d3bd18) 43.23% compared to head (0deb2fb) 89.08%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #479 +/- ## =========================================== + Coverage 43.23% 89.08% +45.84% =========================================== Files 166 6 -160 Lines 7535 348 -7187 =========================================== - Hits 3258 310 -2948 + Misses 4277 38 -4239 ``` | [Flag](https://app.codecov.io/gh/CFD-GO/TCLB/pull/479/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CFD-GO) | Coverage Δ | | |---|---|---| | [d2q9](https://app.codecov.io/gh/CFD-GO/TCLB/pull/479/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CFD-GO) | `?` | | | [d3q27_PSM_NEBB](https://app.codecov.io/gh/CFD-GO/TCLB/pull/479/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CFD-GO) | `?` | | | [d3q27_pf_velocity](https://app.codecov.io/gh/CFD-GO/TCLB/pull/479/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CFD-GO) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CFD-GO#carryforward-flags-in-the-pull-request-comment) to find out more.

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[shkodm]

It seems that breaks something... I am investigating now

[shkodm]

It seems that breaks something... I am investigating now

Never mind, everything seems to be working fine. Tested on the actual fracture case I am running and compare visualisation. Should be good to merge