Fluent Adjoint solver is only capable of shape optimization？

- May 17, 2024 at 9:02 am
  
  shuo wang
  Subscriber
  
  Can the Fluent Adjoint solver, which employs gradient descent, perform functions beyond shape optimization? For instance, determining the gradient of a user-defined scalar with respect to the inlet flow rate？???? The following diagram is a simplification of the problem. HELP please.
- May 17, 2024 at 10:03 am
  
  Rob
  Forum Moderator
  
  The gradient will be a function of the flow, why do you need the Adjoint solver too?
  - May 23, 2024 at 3:30 pm
    
    shuo wang
    Subscriber
    
    Sorry, I didn't explain the background of this issue clearly. My purpose is to invert the actual emission intensity. For example, in an industrial park, a company claims to have a daily emission of 1t/d, but in reality, it may be far more than that. By using real observation data, establish a cost function for the difference between simulated and measured values, and by minimizing the cost function, deduce the actual emission rate.That's why I need a gradient based adjoint solver.
- May 31, 2024 at 9:13 am
  
  Rob
  Forum Moderator
  
  That may be better done with a few simulations and then look for a pattern or link. It's going to be very nonlinear so setting criteria might be more difficult.