[uvw]

Greetings, CFD Online Community!

I'm reaching out to seek your guidance in developing a CL-Drive function within Fluent (2022 R1).
The primary aim of this CL-Drive function is to conduct simulations targeting a specific CL (Lift Coefficient) value, rather than requiring the traditional approach of specifying the AoA (Angle of Attack).
Through this function, the AoA will dynamically adjust across iterations to precisely achieve the designated CL target.
Your insights and expertise in this endeavor would be greatly appreciated.

The main steps of this CL-Drive function can be broken down as follows.
1- Specify a CL target:
This involves setting a desired value for the lift coefficient (CL) that you want the object to achieve during the simulation.

2- Estimation of dCL/dAlpha:
Here, I'm referring to the derivative of the lift coefficient with respect to the angle of attack (AoA). The derivative dCL/dAlpha indicates how much the lift coefficient changes in response to changes in the angle of attack.

3- Specify the maximum number of iterations between AoA updates:
This step involves setting a limit on how many iterations the simulation will perform before updating the angle of attack (AoA) value. By updating the AoA periodically, you can simulate the object's response to changes in its orientation with respect to the airflow.

4- Specify the number of iterations to evaluate dCL_dAlpha by using finite differences:
This refers to the method of numerically approximating the derivative dCL/dAlpha using finite differences. In a computational simulation, you can estimate derivatives by perturbing the input variable (in this case, the angle of attack) by a small amount and observing how the output variable (lift coefficient) changes. By comparing these changes, you can compute an approximation of the derivative. The number of iterations you specify will determine how many times you perform this perturbation and observation process to calculate the derivative accurately.

Thank you sincerely for your time and assistance. Your support is greatly appreciated.

Best regards
uvw
\m/

[AlexanderZ]

are you going to make it in 3d?

[uvw]

Originally Posted by AlexanderZ

are you going to make it in 3d?

Yes. The AoA will be defined in the XZ plane.