1. A multi-purpose versatile modular pulse duplicator system that simulates cardiovascular hemodynamic functions, the system comprising: a plurality of modules each having at least one through channel, wherein the plurality of modules are detachably and fluidly coupled to each other forming a fluidly connecting circulating flow via said at least one through channel of each module; wherein one of the plurality of modules is a pump module having a linear motor disposed thereon to drive a fluid in the circulating flow; and wherein the plurality of modules are adapted to be detached from each other becoming free standing pieces, and be reattached to each other having a different sequence order or having a different quantity of modules, forming yet another fluidly connecting circulating flow via said at least one though channel of each module.