GModule skewsymmetric
1 2 GfsSkewSymmetric GfsBox GfsGEdge {} {
  Time { end = 2 dtmax = 1.e-3 }
  Refine (x > 0.25 || x < -0.25 || y > 0.25 || y < -0.25 ? LEVEL-1 : LEVEL + 1)

  ApproxProjectionParams { tolerance = 1e-6 }
  ProjectionParams { tolerance = 1e-6 }

  InitFaceValues {} {
      U0 = (- cos (2.*M_PI*x)*sin (2.*M_PI*y))
      V0 = (sin (2.*M_PI*x)*cos (2.*M_PI*y))
      U = U0
      V = V0
  }
  OutputScalarNorm { istep = 1 } div-LEVEL { v = Divergence }
  OutputScalarSum { istep = 1 } kinetic-LEVEL { v = Velocity2 }
  OutputErrorNorm { start = end } { 
      awk '{ print 2**(LEVEL+1)/4+2**(LEVEL-1)*3/4,$3,$5,$7,$9 }'
  } { 
      v = Velocity 
  } { 
      s = sqrt(U0*U0 + V0*V0)
      v = E
      relative = 1 
  }
}
GfsBox {}
1 1 right
1 1 top