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[BHE] matrix cache for soil part

Max Jäschke requested to merge Max_Jaeschke/ogs:TBHE_AssmblySpeedUp into master

This MR enables the matrix cache for the linear case in the HeatTransportBHE-Process. Only the soil part is assembled once and cached, the BHE part needs to be assembled every timestep due to the changing flow rates in the BHEs. The use of the matrix cache results in a 50% shorter assembly time.

assemblytime

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behaviour change was documented?
Edited by Max Jäschke

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