There is a mistake in the Static Structural model for the Displacement Y=0 constraint. It is applied to 2 faces. It should be applied to 2 edges at the bottom of the screen.
There is a mistake in the Static Structural model, both parts are Steel, while in the Thermal model, the inner part is Titanium.
In the Thermal model you only have a Temperature input on one side, so the entire assembly reaches the applied temperature. Was that your intention? If so, you don't need to Solve for Temperature in an Analysis in a Thermal model, you can just Apply that Temperature as a Load in Static Structural.
When you say interference fit, I don't see any because the diameters of the two touching faces are equal.
- outer diameter of the inner part at 22 C = 28 mm
- inner diameter of the outer part at 22 C = 28 mm
You need to construct the geometry so the outer diameter of the inner part is larger than the inner diameter of the outer part to generate an interference.
Here are the values of CTE from your model's Engineering Data:
- Outer Steel CTE = 1.2E-05 /C
- Inner Titanium CTE = 9.4E-06 /C
Steel expands faster than Titanium as the temperature increases, therefore the outer part is creating a gap to the inner part as the temperature increases. Was this what you intended?