add missing twp pi (idaholab#401)

recuero · Apr 29, 2020 · eb25146 · eb25146
1 parent d071f7b
commit eb25146
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/userobjects/FFTBufferBase.C b/src/userobjects/FFTBufferBase.C
@@ -118,7 +118,8 @@ FFTBufferBase<T>::FFTBufferBase(const InputParameters & parameters)
     // precompute kvector components for current direction
     _k_table[i].resize(_grid[i]);
     for (int j = 0; j < _grid[i]; ++j)
-      _k_table[i][j] = ((j < (_grid[i] >> 1) + 1) ? Real(j) : (Real(j) - _grid[i])) / _box_size(i);
+      _k_table[i][j] = 2.0 * libMesh::pi *
+                       ((j < (_grid[i] >> 1) + 1) ? Real(j) : (Real(j) - _grid[i])) / _box_size(i);
   }
   _real_space_data.resize(real_space_buffer_size);
   _reciprocal_space_data.resize(reciprocal_space_buffer_size);