I suggest you add a separate flange body with a bolt hole pattern to match the bolt holes in the turbine housing. The flange can be a rectangular block that can have the 3-2-1 kinematic constraint pattern to ground. It can be the same material as the turbine housing so the CTE will match. It can be given a similar temperature to the base of the turbine housing. Use 4 fixed joints to connect the bolt hole pairs to each other. Make the fixed joint have behavoir = deformable. Taking those steps will go a long way to removing artificially induced thermal stress by fixing those holes directly to ground.
Another approach is to use a single remote displacement on the four bolt holes and set behavior = deformable and set all six DOF to 0.
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