diff --git a/Linear/DynamicSim.h b/Linear/DynamicSim.h
index b8c5c79..a56f75b 100644
--- a/Linear/DynamicSim.h
+++ b/Linear/DynamicSim.h
@@ -35,7 +35,7 @@ class DataExporter;
 
 int modalSim (char* infile, size_t nM, bool dumpModes, bool qstatic,
               SIMoutput* model, DataExporter* exporter = nullptr,
-              double zero_tol = -1.0, std::streamsize outPrec = 6);
+              double zero_tol = 1.0e-8, std::streamsize outPrec = 6);
 
 /*!
   \brief Driver for direct simulation of linear dynamics problems.
@@ -48,6 +48,6 @@ int modalSim (char* infile, size_t nM, bool dumpModes, bool qstatic,
 */
 
 int dynamicSim (char* infile, SIMoutput* model, bool fixDup = false,
-                double zero_tol = -1.0, std::streamsize outPrec = 6);
+                double zero_tol = 1.0e-8, std::streamsize outPrec = 6);
 
 #endif
diff --git a/NonlinearDriver.h b/NonlinearDriver.h
index 96a2638..e27e88f 100644
--- a/NonlinearDriver.h
+++ b/NonlinearDriver.h
@@ -74,6 +74,18 @@ class NonlinearDriver : public NonLinSIM
   //! \brief Reads model data from the specified input file \a *fileName.
   virtual bool read(const char* fileName);
 
+  //! \brief Invokes the main pseudo-time stepping simulation loop.
+  //! \param writer HDF5 results exporter
+  //! \param restart HDF5 restart handler
+  //! \param[in] zero_tol Truncate norm values smaller than this to zero
+  //! \param[in] outPrec Number of digits after the decimal point in norm print
+  int solveProblem(DataExporter* writer = nullptr,
+                   HDF5Restart* restart = nullptr,
+                   double zero_tol = 1.0e-8, std::streamsize outPrec = 0)
+  {
+    return this->solveProblem(writer,restart,nullptr,0,0.0,zero_tol,outPrec);
+  }
+
   //! \brief Invokes the main pseudo-time stepping simulation loop.
   //! \param writer HDF5 results exporter
   //! \param restart HDF5 restart handler
@@ -84,7 +96,7 @@ class NonlinearDriver : public NonLinSIM
   //! \param[in] outPrec Number of digits after the decimal point in norm print
   int solveProblem(DataExporter* writer, HDF5Restart* restart,
                    utl::LogStream* oss, bool printMax, double dtDump,
-                   double zero_tol, std::streamsize outPrec);
+                   double zero_tol = 1.0e-8, std::streamsize outPrec = 0);
 
   //! \brief Serialize solution state for restarting purposes.
   //! \param data Container for serialized data