前端进度条性能优化、仿真结束后后处理优化；后端C代码生成流程优化：先识别来源，再按照已知未知量需求排序，最后局部求解

app/simulation/components/experimental/flow/orifice.py

@@ -6,12 +6,13 @@ from app.simulation.core.catalog import ComponentDisplaySpec, PortDisplaySpec
 from app.simulation.core.metadata import ParameterDefinition
 from app.simulation.core.medium import IdealGasMedium
 from app.simulation.core.ports import PortDefinition
+from app.simulation.core.port_computation import FLOW_SUPPLY
 
 class Orifice(AlgebraicComponent):
     """Python port of ModelicaModels.Myorifice."""
     MODEL_TYPE = 'orifice'
     MODEL_VERSION = '1.0.0'
-    PORTS = (PortDefinition.pneumatic('port_a', nominal_role='inlet'), PortDefinition.pneumatic('port_b', nominal_role='outlet'))
+    PORTS = (PortDefinition.pneumatic('port_a', nominal_role='inlet', computation=FLOW_SUPPLY), PortDefinition.pneumatic('port_b', nominal_role='outlet', computation=FLOW_SUPPLY))
     PARAMETERS = (ParameterDefinition('K', 1e-05, label='流量系数', quantity='flow_coefficient', unit='kg/(s*Pa^0.5)', minimum=0.0), ParameterDefinition('opening', 1.0, label='开度', minimum=0.0, maximum=1.0))
     RESULT_VARIABLES = ()
     DISPLAY = ComponentDisplaySpec(label='孔板/阀门', library_id='experimental', category_id='flow', symbol='orifice', ports=(PortDisplaySpec('port_a', 'left', order=10), PortDisplaySpec('port_b', 'right', order=20)), order=40)