Error: delete-material: still in use by wall-fluid

- July 2, 2019 at 6:26 am
  
  DineshKanesan123
  Subscriber
  
  Dear Users,
  
  Im trying to create an erosion study using stainless steel. However, i cant change the solid material to steel from aluminum. I keep getting this message below whenever i try to delete aluminium.
  
  Error: delete-material: still in use by wall-fluid.
  Error Object: aluminum
  
  Does anyone know how to change the wall fluid ?
- July 2, 2019 at 9:14 am
  
  Rob
  Forum Moderator
  
  The erosion models use parameters in the Wall > DPM tab, so the material doesn't really matter unless you also have heat transfer. You need to add another solid material and change the wall material: you can't delete a material that's being used (hence the error).
- July 3, 2019 at 1:01 am
  
  DineshKanesan123
  Subscriber
  
  Thank you very much for the explanation. I did try adding other solid materials before deleting aluminum but it didnt work. However, since the erosion models use the parameters in the dpm tab, is changing the density of aluminum in the material properties to the density of stainless steel sufficient for modeling erosion in stainless steel pipes ?
- July 3, 2019 at 8:30 am
  
  Rob
  Forum Moderator
  
  You also need to go into the wall and change it's material from aluminium to whatever before you can delete aluminium. Altering the properties of Al will also work, you can change the name too.
- July 4, 2019 at 5:21 am
  
  DineshKanesan123
  Subscriber
  
  Thank you very much