using absorbing layer to reduce the model size

Hi all,

Im using ABAQUS to simulate the ultrasonic wave propegation in the Prestressed concrete beam, however indorder to get a results I have to use very small mesh around 1mm and it is iompossible to run the simulation with this small mesh .just wondering if any can help me to reduce the model size such as using the basorbing layer or  any other technique can reduce the model size without affecting the results?

your help is really appreciated

manal