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src/main/java/neqsim/processSimulation/processEquipment/valve/ThrottlingValve.java

@@ -37,6 +37,9 @@ public class ThrottlingValve extends TwoPortEquipment implements ValveInterface
   private String pressureUnit = "bara";
   private boolean acceptNegativeDP = true;
   ValveMechanicalDesign valveMechanicalDesign;
+  boolean isCalcPressure = false;
+
+
 
   /**
    * <p>
@@ -185,6 +188,14 @@ public void run(UUID id) {
     ThermodynamicOperations thermoOps = new ThermodynamicOperations(thermoSystem);
     thermoSystem.init(3);
     double enthalpy = thermoSystem.getEnthalpy();
+
+    if (valveCvSet && isCalcPressure) {
+      double outp = (inStream.getThermoSystem().getPressure()
+          - Math.pow(inStream.getThermoSystem().getTotalNumberOfMoles() / Cv
+              / getPercentValveOpening() * 100.0, 2.0) * thermoSystem.getDensity());
+      setOutletPressure(outp);
+    }
+
     if ((thermoSystem.getPressure(pressureUnit) - pressure) < 0) {
       if (isAcceptNegativeDP()) {
         thermoSystem.setPressure(pressure, pressureUnit);
@@ -193,6 +204,7 @@ public void run(UUID id) {
       thermoSystem.setPressure(pressure, pressureUnit);
     }
 
+
     if (getSpecification().equals("out stream")) {
       thermoSystem.setPressure(outStream.getPressure(), pressureUnit);
     }
@@ -459,4 +471,8 @@ public void initMechanicalDesign() {
   public ValveMechanicalDesign getMechanicalDesign() {
     return valveMechanicalDesign;
   }
+
+  public void setIsCalcOutPressure(boolean isSetPres) {
+    isCalcPressure = isSetPres;
+  }
 }

src/test/java/neqsim/processSimulation/processEquipment/reservoir/SimpleReservoirTest.java

@@ -4,7 +4,10 @@
 import org.apache.logging.log4j.Logger;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import neqsim.processSimulation.processEquipment.compressor.Compressor;
+import neqsim.processSimulation.processEquipment.heatExchanger.Cooler;
 import neqsim.processSimulation.processEquipment.stream.StreamInterface;
+import neqsim.processSimulation.processEquipment.valve.ThrottlingValve;
 
 public class SimpleReservoirTest {
   static Logger logger = LogManager.getLogger(SimpleReservoirTest.class);
@@ -65,4 +68,85 @@ void testRun2() {
     Assertions.assertEquals(52.0, reservoirOps.getLowPressureLimit("bara"), 0.1);
     Assertions.assertEquals(52.0e5, reservoirOps.getLowPressureLimit("Pa"), 0.1);
   }
+
+  @Test
+  void testPureGasReservoir() {
+    neqsim.thermo.system.SystemInterface fluid1 =
+        new neqsim.thermo.system.SystemPrEos(273.15 + 13, 59.7);
+    fluid1.addComponent("water", 1.1);
+    fluid1.addComponent("methane", 99.5);
+    fluid1.addComponent("nitrogen", 0.45);
+    fluid1.setMixingRule("classic");
+    fluid1.setMultiPhaseCheck(true);
+
+    SimpleReservoir reservoirOps = new SimpleReservoir("Well 1 reservoir");
+    reservoirOps.setReservoirFluid(fluid1, 1 * 27 * 1e9 / 60.0, 0.0, 1.0e9);
+    reservoirOps.setLowPressureLimit(5.0, "bara");
+
+    StreamInterface producedGasStream = reservoirOps.addGasProducer("gas producer 1");
+    // StreamInterface producedWaterStream = reservoirOps.addWaterProducer("water producer 1");
+
+    double[] productionprofile = new double[] {10.38, 9.9, 9.22, 8.18, 6.94, 5.83, 4.91, 4.09, 3.41,
+        2.86, 2.35, 2.35, 2.35, 2.35, 2.35, 2.35, 2.35, 2.35};
+    // double[] producedwaterprofile =
+    // new double[] {1e-12, 1e-12, 1e-12, 50.0, 100.94, 5.83, 4.91, 4.09};
+    reservoirOps.run();
+
+    System.out.println("OGIP " + reservoirOps.getOGIP("GSm3") + " GMSm3");
+    double deltaTime = 24 * 60 * 60.0 * 365;
+    for (int i = 0; i < 13; i++) {
+
+      producedGasStream.setFlowRate(productionprofile[i], "MSm3/day");
+      // producedWaterStream.setFlowRate(producedwaterprofile[i] * 1000.0, "kg/day");
+      System.out.println("pressure " + reservoirOps.getReservoirFluid().getPressure("bara")
+          + " water in gas " + producedGasStream.getFluid().getComponent("water").getx()
+          + " produced MSm3oe " + reservoirOps.getProductionTotal("MSm3 oe"));
+      reservoirOps.runTransient(deltaTime);
+
+      System.out
+          .println("flow calc" + Math.sqrt((10.0) / reservoirOps.getFluid().getDensity("kg/m3")));
+    }
+    // valve1.setOutletPressure(51);
+    // valve1.run();
+    ThrottlingValve valve1 = new ThrottlingValve("valve1", producedGasStream);
+    // valve1.setOutletPressure(51);
+    valve1.setCv(25443.44371323);
+    valve1.setIsCalcOutPressure(true);
+    valve1.run();
+    System.out.println("flow " + valve1.getOutletStream().getFlowRate("MSm3/day"));
+    System.out.println("out pres " + valve1.getOutletPressure());
+    System.out.println("Cv " + valve1.getCv());
+
+    Compressor subseaCompressor = new Compressor("compressor 1", valve1.getOutletStream());
+    subseaCompressor.setOutletPressure(40.0, "bara");
+    subseaCompressor.setPolytropicEfficiency(0.8);
+    subseaCompressor.setUsePolytropicCalc(true);
+    subseaCompressor.run();
+
+    System.out.println("compressor power " + subseaCompressor.getPower("MW") + " head "
+        + subseaCompressor.getPolytropicFluidHead() + " kJ/kg" + " flow "
+        + subseaCompressor.getInletStream().getFlowRate("m3/hr") + " m3/hr " + " pressure out "
+        + subseaCompressor.getOutletPressure() + " pressure in "
+        + subseaCompressor.getInletPressure() + " pressure ratio "
+        + subseaCompressor.getOutletPressure() / subseaCompressor.getInletPressure());
+
+    Cooler cooler1 = new Cooler("cooler1", subseaCompressor.getOutletStream());
+    cooler1.setOutTemperature(30.0, "C");
+
+    Compressor subseaCompressor2 = new Compressor("compressor 1", cooler1.getOutletStream());
+    subseaCompressor2.setOutletPressure(170.0, "bara");
+    subseaCompressor2.setPolytropicEfficiency(0.8);
+    subseaCompressor2.setUsePolytropicCalc(true);
+    subseaCompressor2.run();
+
+    System.out.println("compressor power " + subseaCompressor2.getPower("MW") + " head "
+        + subseaCompressor2.getPolytropicFluidHead() + " kJ/kg" + " flow "
+        + subseaCompressor2.getInletStream().getFlowRate("m3/hr") + " m3/hr " + " pressure out "
+        + subseaCompressor2.getOutletPressure() + " pressure in "
+        + subseaCompressor2.getInletPressure() + " pressure ratio "
+        + subseaCompressor2.getOutletPressure() / subseaCompressor2.getInletPressure());
+
+
+
+  }
 }