field norms output: switching to scientific, correct width (#1705)

Author: mbkuhn

amr-wind/utilities/sampling/FieldNorms.H

@@ -78,7 +78,7 @@ private:
     int m_width{18};
 
     //! precision in ASCII output
-    int m_precision{12};
+    int m_precision{10};
 
     //! Type of norm
     int m_norm_type{2};

amr-wind/utilities/sampling/FieldNorms.cpp

@@ -248,7 +248,7 @@ void FieldNorms::write_ascii()
 
     if (amrex::ParallelDescriptor::IOProcessor()) {
         std::ofstream f(m_out_fname.c_str(), std::ios_base::app);
-        f << m_sim.time().time_index() << std::fixed
+        f << m_sim.time().time_index() << std::scientific
           << std::setprecision(m_precision) << std::setw(m_width)
           << m_sim.time().new_time();
         for (double m_fnorm : m_fnorms) {