Learning Forum

[shuo wang]

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.

[Rob]

The gradient will be a function of the flow, why do you need the Adjoint solver too?

[shuo wang]

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.

[Rob]

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.