Questions about the thermal stress simulation

Now I am trying to do the thermal stress simulation, but comsol do the thermal and mechanical simulations together. I want to do the thermal and mechanical simulation separately, because the thermal one is too complecated. Both simulations are time dependent. How can I put the results of temperature into the mechanical simulation? Now I tried to buil 2 studies. In Study 1 I only do the thermal simulation. In Study 2 I set up a thermal simulation without boundary conditions and couple it with the mechanical simulation. Then I set the initial values and values of variables to the results of study 1, but the results seem to be wrong. Are there any other ways to do so?