how to solve a one dimension thermal diffusion equation

[subtex]

hi

i am new to these forums and new to labview.

please see if you can help me with this - 

i am taking 8 sets of data - over 2 minutes - sampled at one second apart. The 8 data points are along 8 equidistand points of a rod and the data itself is the temparature, recorded as a voltage (v) by the thermistor 

The data satisfies the following equation - 

d^2v/dx^2 = k d^2v/dt^2

that is the one dimensional laplacian of the voltage = k times the 2nd time derivative of the voltage

how to solve the equation in labview !!??

[altenbach]

Open the example finder and look at the example "PDE Thermal distribution.vi".

It solves your problem in two dimensions, so all you need is to simplify it to one dimension. 😄

See how far you get.....

[subtex]

hi

i have looked under sxamples but i cant find "PDE thermal distribution" - could you please tell me where it is.

yes but if it is solved in 2d then it cant be too tough to rip the 1D from it

[altenbach]

A few options:

• Search for "PDE", that should narrow it down to a few.
• Browse by task...new examples for LabVIEW 2009...
• browse by directory structure...math...pde.llb

What is your LabVIEW version. If it is older than 2009, you won't have it.

[subtex]

fount it...now lets see

[subtex]

to make it 1d - 

in the main panel - 

i set y value =0 and y range =0 (whats the difference anyway). Cant i get rid of the Y altogether

i can change the cases in the block diagram panel, to 1D, but i have to know whcih type of 1D we are doing - if initial data is taken by a sensor and fed to ELVIs and then stored in array then is the initial and boundary condition "numeric" or "VI"

Also i do not need any plots or graphs- just need to solve the eq to get the K

thanks a lot

[subtex]

any other tips or advice

[maharba]

Here there is what you need for 3d 2d or 1d problems. That's a heat diffusion simulator

http://cfdosc.wordpress.com/2013/07/05/tutorial-for-friendly-user-unterface-edna-screenshots/

good luck

[altenbach]

I think the OP was looking for a LabVIEW based solution, though.