try fix (#1029)

* try fix

* update

Author: EvenSol

src/main/java/neqsim/thermodynamicOperations/flashOps/Flash.java

@@ -352,9 +352,15 @@ public boolean stabilityCheck() {
         this.solidPhaseFlash();
       }
     } else {
+      RachfordRice rachfordRice = new RachfordRice();
       try {
-        system.setBeta(RachfordRice.calcBeta(system.getKvector(), system.getzvector()));
+        system.setBeta(rachfordRice.calcBeta(system.getKvector(), system.getzvector()));
       } catch (Exception ex) {
+        if (!Double.isNaN(rachfordRice.getBeta()[0])) {
+          system.setBeta(rachfordRice.getBeta()[0]);
+        } else {
+          system.setBeta(Double.NaN);
+        }
         logger.error(ex.getMessage(), ex);
       }
       system.calc_x_y();

src/main/java/neqsim/thermodynamicOperations/flashOps/RachfordRice.java

@@ -6,13 +6,16 @@
 
 package neqsim.thermodynamicOperations.flashOps;
 
+import java.io.Serializable;
+
 /**
  * RachfordRice classes.
  *
  * @author Even Solbraa
  */
-public class RachfordRice {
+public class RachfordRice implements Serializable {
   private static final long serialVersionUID = 1000;
+  private double[] beta = new double[2];
 
   /**
    * <p>
@@ -25,7 +28,7 @@ public class RachfordRice {
    * @throws neqsim.util.exception.IsNaNException if any.
    * @throws neqsim.util.exception.TooManyIterationsException if any.
    */
-  public static double calcBeta(double[] K, double[] z) throws neqsim.util.exception.IsNaNException,
+  public double calcBeta(double[] K, double[] z) throws neqsim.util.exception.IsNaNException,
       neqsim.util.exception.TooManyIterationsException {
 
     int i;
@@ -138,6 +141,8 @@ public static double calcBeta(double[] K, double[] z) throws neqsim.util.excepti
     } else if (nybeta >= 1.0 - tolerance) {
       nybeta = 1.0 - tolerance;
     }
+    beta[0] = nybeta;
+    beta[1] = 1.0 - nybeta;
 
     if (iterations >= maxIterations) {
       throw new neqsim.util.exception.TooManyIterationsException(new RachfordRice(), "calcBeta",
@@ -159,8 +164,7 @@ public static double calcBeta(double[] K, double[] z) throws neqsim.util.excepti
    * @throws neqsim.util.exception.IsNaNException if any.
    * @throws neqsim.util.exception.TooManyIterationsException if any.
    */
-  public static double calcBeta2(double[] K, double[] z)
-      throws neqsim.util.exception.IsNaNException,
+  public double calcBeta2(double[] K, double[] z) throws neqsim.util.exception.IsNaNException,
       neqsim.util.exception.TooManyIterationsException {
 
     double tolerance = neqsim.thermo.ThermodynamicModelSettings.phaseFractionMinimumLimit;
@@ -269,6 +273,9 @@ public static double calcBeta2(double[] K, double[] z)
       V = 1.0 - tolerance;
     }
 
+    beta[0] = V;
+    beta[1] = 1.0 - V;
+
     if (iter >= maxIterations) {
       throw new neqsim.util.exception.TooManyIterationsException(new RachfordRice(), "calcBeta",
           maxIterations);
@@ -280,4 +287,8 @@ public static double calcBeta2(double[] K, double[] z)
     return V;
   }
 
+  public double[] getBeta() {
+    return beta;
+  }
+
 }

src/main/java/neqsim/thermodynamicOperations/flashOps/TPflash.java

@@ -90,8 +90,10 @@ public void sucsSubs() {
     }
 
     double oldBeta = system.getBeta();
+
+    RachfordRice rachfordRice = new RachfordRice();
     try {
-      system.setBeta(RachfordRice.calcBeta(system.getKvector(), system.getzvector()));
+      system.setBeta(rachfordRice.calcBeta(system.getKvector(), system.getzvector()));
     } catch (IsNaNException ex) {
       logger.warn("Not able to calculate beta. Value is NaN");
       system.setBeta(oldBeta);
@@ -132,13 +134,16 @@ public void accselerateSucsSubs() {
       system.getPhase(1).getComponent(i).setK(Math.exp(lnK[i]));
     }
     double oldBeta = system.getBeta();
+    RachfordRice rachfordRice = new RachfordRice();
     try {
-      system.setBeta(RachfordRice.calcBeta(system.getKvector(), system.getzvector()));
+      system.setBeta(rachfordRice.calcBeta(system.getKvector(), system.getzvector()));
     } catch (Exception ex) {
+      system.setBeta(rachfordRice.getBeta()[0]);
       if (system.getBeta() > 1.0 - betaTolerance || system.getBeta() < betaTolerance) {
         system.setBeta(oldBeta);
       }
-      logger.info("temperature " + system.getTemperature() + " pressure " + system.getPressure());
+      // logger.info("temperature " + system.getTemperature() + " pressure " +
+      // system.getPressure());
       logger.error(ex.getMessage(), ex);
     }
 
@@ -178,7 +183,8 @@ public void resetK() {
       system.getPhase(1).getComponents()[i].setK(Math.exp(lnK[i]));
     }
     try {
-      system.setBeta(RachfordRice.calcBeta(system.getKvector(), system.getzvector()));
+      RachfordRice rachfordRice = new RachfordRice();
+      system.setBeta(rachfordRice.calcBeta(system.getKvector(), system.getzvector()));
       system.calc_x_y();
       system.init(1);
     } catch (Exception ex) {
@@ -249,7 +255,8 @@ public void run() {
 
     // Calculates phase fractions and initial composition based on Wilson K-factors
     try {
-      system.setBeta(RachfordRice.calcBeta(system.getKvector(), system.getzvector()));
+      RachfordRice rachfordRice = new RachfordRice();
+      system.setBeta(rachfordRice.calcBeta(system.getKvector(), system.getzvector()));
     } catch (Exception ex) {
       logger.error(ex.getMessage(), ex);
     }

src/test/java/neqsim/thermodynamicOperations/flashOps/RachfordRiceTest.java

@@ -11,7 +11,8 @@ void testCalcBeta() {
     double[] K = new double[] {2.0, 0.01};
 
     try {
-      Assertions.assertEquals(0.407070707, RachfordRice.calcBeta(K, z), 1e-6);
+      RachfordRice rachfordRice = new RachfordRice();
+      Assertions.assertEquals(0.407070707, rachfordRice.calcBeta(K, z), 1e-6);
     } catch (Exception e) {
       e.printStackTrace();
     }
@@ -25,7 +26,8 @@ void testCalcBetaMethod2() {
     double[] K = new double[] {2.0, 0.01};
 
     try {
-      Assertions.assertEquals(0.407070707, RachfordRice.calcBeta(K, z), 1e-6);
+      RachfordRice rachfordRice = new RachfordRice();
+      Assertions.assertEquals(0.407070707, rachfordRice.calcBeta(K, z), 1e-6);
     } catch (Exception e) {
       e.printStackTrace();
     }