System or 1D simulations compute the transient behavior of complete hydraulic, thermal or mechanical systems. Hydraulic networks are sometimes complex and are composed of multiple components like valves, pumps, manifolds, heat exchangers etc. Each component has a representative analytical 1D model using which the performance of the entire system is predicted. System simulations have limitations in describing complex 3D behavior of flow in components. Since 3D CFD describes a physical system completely in three dimensions by resolving the physical phenomena based on conservation & transport equations, a coupling between 1D and 3D is sometimes preferred for accurate prediction of system level performance. One of the drawbacks of coupled simulations is the turnaround time, since 3D CFD usually involves more time. With the fast and robust solver of Simerics-MP+, 3D simulations can be performed much faster with relative ease and accuracy. Hence with Simerics-MP+ coupled with GT-SUITE, system level 1D simulations coupled with 3D CFD can be performed reasonably faster thereby improving productivity.
Co-simulation of a 1D system with 3D CFD models enables the sharing of boundary data between 1D and 3D model. This enables simulating the overall fluid system by coupling them with more detailed CFD simulation of 3D flows in critical regions or parts of the network. Coupling refers to the exchange of information related to flow (i.e., pressure, velocity, temperature, composition) at the end of every CFD timestep between GT-SUITE and Simerics-MP+:
The GT Coupling module of Simerics-MP+ enables this co-simulation of 1D system simulations in GT-SUITE with the 3D CFD simulations in Simerics-MP+. This module seamlessly integrates with GT-SUITE in running the co-simulation.
The GT Coupling matches the fluid components in the GT-SUITE model with the corresponding components in the 3D fluid model. Additionally, the interfaces before and after the 3D components are identified and assigned with appropriate inlet and outlet boundary conditions, as per the upstream and downstream flow calculations in GT-SUITE.
The GT Coupling module and capabilities are explained as follows:
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