Reply To: I want to save the number of elements.

[SSURA]

Yes, you might have faced some issues in solving the simulation as Air cannot be set as a loading material in Static Structural. The simulation can be solved using FSI (Fluid Structure Interaction)(Ref 1), where the interaction between two different physics phenomena, done in separate analyses. The data between the systems is transferred by System Coupling (Ref 2).
So you can model the wing in a Structural analysis system (Static/ Transient depending on usage) which uses the mechanical as a solver and takes the loading data from the fluid analysis for each iteration.
To model the fluid flow simulation, you can use the fluid solver.
You can refer to the videos (4,5) to perform the coupled analysis.
References-
Fluid-Structure Interaction (FSI) (ansys.com)
One-Way FSI Transfers Using System Coupling in Workbench (ansys.com)
Best Practices for Coupled Fluid-Structure Interaction (FSI) (ansys.com)
Analyzing FSI with ANSYS Fluent and Mechanical - PartI https://youtu.be/KYqu9P0R60A
Analyzing FSI with ANSYS Fluent and Mechanical - PartII https://www.youtube.com/watch?v=Hc5-GT9iUb4

Thanks Sahil