how can I simulate a static obstacle in simulink?

I have the kinematic model of a differential drive robot. I have been able to navigate it from one point to another in an obstacle free environment. Now I want to insert a static obstacle and ovoid them using obstacle avoidance techniques.

The problem is I don't know How to simulate an obstacle in simulink.

[kchaou fatma]

hello, Can you please tel me please how you have creat the kinematic model of the robot? Thank you