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Gigiont1-Visitor
1-Visitor
October 30, 2015
Question

Error in Pdesolve

  • October 30, 2015
  • 2 replies
  • 1685 views

Hello,

I'm trying to solve a "standard" 2D partial differential equation but the Pdesolve function gives the error: "The initial conditions are not consistent with the endpoints specified in the temporal range". I don't understand why.

I also copied the Worksheet example on using Pdesolve into the file and it gives "Unknown error".

I'm attaching the file in MC14.

Thanks for the help.

Gigi

2 replies

V
ValeryOchkov24-Ruby IV
24-Ruby IV
October 31, 2015

The error message in Mathcad 15:

pde-error.png

I tried to solve problems by using functions pdesolve, but soon understand that this function is flawed and it did not take into Mathcad Prime. Or I do not understand this function.

Now I use the method finite elements.

See please three figs from the study 18 of the book Thermal Engineering studies with Excel, Mathcad and Internet

Problem: I know the temperature at the corners of a rectangular plate, and I want to know the temperature inside the plate. This solution we can be transferred to a box.

18-10-pdesolve-error.png

18-11-Pde-Plate-Progr.png

18-12-Counter-Plot.png

A
AlanStevens19-Tanzanite
19-Tanzanite
October 31, 2015

Try using the "relax" function for Poisson equations.

Alan

V
ValeryOchkov24-Ruby IV
24-Ruby IV
October 31, 2015

AlanStevens wrote:

Try using the "relax" function for Poisson equations.

Alan

Some text and figure 18.8 from the book Thermal  Engineering studies with Excel, Mathcad and Internet

"One such problem was just at the author’s hand who wrote and corrected the text the tablet PC, the back wall of which was warm in several places. This resulted in cooling down the tablet chips without using noisy and energy consuming fans built into laptops and desktops. Fig. 18.8 shows the final part of the Mathcad-document that calculates the temperature field of three chips on the computer board with two dimensions of x and y."

 


 

18-08.png

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