Parallel Execution of Functional Mock-up Units in Buildings Modeling

Ozmen, Ozgur¹  Nutaro, James J.¹  New, Joshua Ryan¹ 

[1] Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

关键词: Modelica;    FMI;    OpenMP;    Dymola;    Buildings Modeling;   

DOI  :  10.2172/1257905
RP-ID  :  ORNL/TM--2016/173
PID  :  OSTI ID: 1257905
Others  :  Other: BT0305000
Others  :  CEBT105

学科分类：数学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

A Functional Mock-up Interface (FMI) defines a standardized interface to be used in computer simulations to develop complex cyber-physical systems. FMI implementation by a software modeling tool enables the creation of a simulation model that can be interconnected, or the creation of a software library called a Functional Mock-up Unit (FMU). This report describes an FMU wrapper implementation that imports FMUs into a C++ environment and uses an Euler solver that executes FMUs in parallel using Open Multi-Processing (OpenMP). The purpose of this report is to elucidate the runtime performance of the solver when a multi-component system is imported as a single FMU (for the whole system) or as multiple FMUs (for different groups of components as sub-systems). This performance comparison is conducted using two test cases: (1) a simple, multi-tank problem; and (2) a more realistic use case based on the Modelica Buildings Library. In both test cases, the performance gains are promising when each FMU consists of a large number of states and state events that are wrapped in a single FMU. Load balancing is demonstrated to be a critical factor in speeding up parallel execution of multiple FMUs.