How to Input a 10th Order Fourier Interpolation Function in Femlab?

[priyankp]

Homework Statement

I have to solve transient n-s equations using femlab for a plenum, inlet of which is connected to a compressor, now at compressor exit i know values of axial velocity coefficient at different time steps using which i can generate a Fourier interpolation function which i need to feed as input to femlab (i have checked that 10th order Fourier interpolation function matches with my data)

Homework Equations

how do i pass a 10th order Fourier interpolation function for inflow velocity to femlab?, Is there some easy way to generate such function and pass it? or can i directly provide it with data?

The Attempt at a Solution

i haven't been able to solve it yet...

 

[KataKoniK]

Thank you for sharing your question with us. Solving transient n-s equations using femlab for a plenum with an inlet connected to a compressor can be a complex and challenging task. It seems like you have already made some progress by obtaining the values of axial velocity coefficient at different time steps and generating a Fourier interpolation function for it.

To pass this function as an input to femlab, you can use the "Interpolation" feature in femlab. This feature allows you to input data points and generate a polynomial or spline function for interpolation. In your case, you can input your data points for the axial velocity coefficient at different time steps and choose the 10th order Fourier interpolation function as the type of interpolation. This function can then be used as an input to your femlab simulation.

Alternatively, if you are familiar with programming, you can also write a script to generate the Fourier interpolation function and then pass it as an input to femlab.

I hope this helps you in solving your problem. If you have any further questions or need more assistance, please do not hesitate to ask. Good luck with your simulation!

 

[piercas]

I would first suggest checking the documentation or contacting the developers of Femlab for specific instructions on how to pass a 10th order Fourier interpolation function for inflow velocity. They may have a specific method or tool for doing so. If not, here are some general tips:

1. Check if Femlab has a built-in function or feature for generating Fourier interpolation functions. If so, follow the instructions provided by the software.

2. If there is no built-in function, you can manually generate the Fourier interpolation function using mathematical software such as MATLAB or Mathematica. This would involve using the data you have for the axial velocity coefficient at different time steps and fitting it to a Fourier series. You can then export this function and use it as input in Femlab.

3. Alternatively, you can directly provide the data to Femlab. However, this may require some additional steps such as converting the data into the correct format for the software to recognize it as a Fourier interpolation function.

In any case, it is important to thoroughly read the documentation and understand the input requirements for Femlab in order to successfully pass the Fourier interpolation function for the inflow velocity. If you are still unable to solve the problem, you may need to seek assistance from a more experienced user or the developers of Femlab.