This paper introduces a new process for computational design synthesis. It starts from functional requirements to generate one or more topologies of components. This process is implemented using Model-Driven Engineering techniques and Constraint Programming solving capabilities. Model transformations are used to transform functions and available components to a CSP. This problem is solved with a CSP solver, which solutions are transformed to topological architectures. The process is successfully applied on the design synthesis of an autonomous generator. It produces about 60 relevant solutions from which we found some existing product architectures.