Hi Ajay (@aharish)!
The D1 refers to the incompressibility factor. The lowest the value, the more incompressible material will be. But making it low enough normally leads to divergence.
You are right about the locking effect. Unfortunately, SimScale don’t detect this effect automatically. Whereas, you can avoid this by using reduced integration scheme under tree item Mesh.
But as I already mentioned, make sure the value of your D1 is not low enough otherwise you may run in to convergence problem.
I hope this help. If you have any question/s, feel free to ask.