I'm trying to understand how vibration affects segregation of particles composed of glass beads. When I apply more than 1e9 Pa for Young's modulus, the Aspherix shows an error 'youngModulus <==1e9 required for SI units (use command 'hard particles yes' to override it). So, I could not find this command in Aspherix GUI program in 'material properties' section. Could you please give some hint how to solve it?
Ps. Or should I use other units? i haven't tried to use other units yet.