MA: DG for radial flow

[Yuvraj2710]

• Derive the DG for the radial flow model
• Literature research
  • have others developed numerical solvers for this?
  • is there an analytical solution for the linear case?
  • are there other radial flow models, i.e. people who consider a different model (e.g. constant velocity)?
• Implement the scheme in CADET-Julia
• Implement basic tests (Julia)
• Derive the Jacobian
• Implement the method (with Jacobian) in CADET-Core, fixes Improve spatial numerical method for radial flow models #296
• dependence of film/axial dispersion on velocity
• Find case studies in the literature that we can reproduce