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[BHE] fixed the pipe diameter parameter in the BHE 1U type

Shuang Chen requested to merge ShuangChen88/ogs:BHE into master

This MR is the supplement for the issue described in #3080 (closed) and the MR in !3384 (merged). Mistakes were found on the parameter pipe diameter in the 1U type BHE. The inner pipe diameter is used for the parameter 'd_{o}' to calculate the thermal resistance due to thermal conductivity of the pipe wall material, as well as the cross section area of the BHE configurations. The parameter related reference functions can be found in the Eq. 51 in Diersch's paper (2011) and Table M.4 in FEFLOW book(2014). However according to the nomenclature, the subscript 'o' should denote the outer side diameter of the pipe with considering the pipe wall thickness.

Details changes are list as following:

  1. Uses the outer side diameter as the pipe diameter parameter to calculate the thermal resistance due to thermal conductivity of the pipe wall material for BHE 1U type.
  2. Uses the outer side diameter as the pipe diameter parameter to calculate the cross section area of the 1U type BHE configurations.
  3. All the CTest results in the 1U type BHE related benchmarks have been updated.
  4. The results figure in the 1U type BHE related benchmark 'A 3-BHE Array Coupled With Pipe Network' have been updated.
Edited by Shuang Chen

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