A system generates a customized application data structure for modeling physical systems. The system includes a processor, an input device, optionally a display device, and a memory device. One or more processors are adapted, during use, to embed a multiphysics model data structure in the application data structure. The multiphysics model data structure comprises a representation of one or more models of physical systems. Data representing application features are added to the application data structure. Each application feature comprises one or more of (i) first data representing at least one form feature, and/or (ii) second data representing at least one action feature. A customized application data structure is generated providing, when executed, a customized modeling of the physical systems using the at least one modeling operation, the at least one geometry of at least a part of the one or more models of physical systems, and at least one application feature.