Hello Everyone,
I am applying a Fluid Structure Interaction model where the Fluid and Structure are considered to be in 2D. I have implemented the interaction between both but now I would like to validate my results. What I have as experimental results is the following:
A wind tunnel test was made for a membrane wing structure and all the results are tabulated. However the problem is that in the software in which I am working with and developing (which is also against norms), the membrane cannot be described in 2D. So one suggestion was that the airfoil was described using cables. The problem is described as follows:
The wing's Trailing Edge and Leading Edge are considered to be Fixed Boundary Conditions whereas the inner structure is a Cable Structure, similar to 3D case (in Boundary Conditions).
I ran the simulation for the parameters given from the membrane and after so many trials and playing around with the parameters, I figured that although both Membranes and Cables behave the same when exerted to external loads, there is no correlation in the results obtained and the parameters used are not related; the parameters involved are the Structure' s Young Modulus (E), the Prestress Value (Sigma0) and the Thickness (A) of the membrane or the Cable' s Area (A). So my Question is as follows:
Is there a way to model the membrane in 2D using cable Structures? If yes please I would appreciate the help.
If not, and you have another suggestion please let me know what it might be.
Thank you for everyone participating in the answer.
Bassel Saridar
I am not sure about what you want to do but a 2D problem is actually like a 3D model repeating indefinitely the 2D plane in the spanwise direction. This way you can assume the area of the membrane as (length of membrane in the 2D plane)X (1m).
Similarily you can evaluate the elastic properties. I used to do this way in one of my papers.
Of course, the experimental measurements are really 3D and do not necessarily match the 2D model.
Thank you for your answer,
Actually this is what I did, I took the width direction to be 1(unit) which is 1 m and what I got was completely different from the experimental results. However whenever i decreased the area by 10^(-3), I got good results. But this doesn't really make any sense.
By the way I am solving both the fluid and Structure with FEM.
Can you share your paper here please
Bassel Saridar
I would first check if the computational parameters match the experimental ones. However, the 3D experiment can produce a physics of the flow that cannot be described by a 2D model.
This is the paper Article 2-D Transmitral flows simulation by means of the immersed bo...
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