Help Curle Post Processing

AlbertoArtoni · January 16, 2022, 11:02

Hi!

I was checking the implementation of the function object Curle.
I don't understand how it has been implemented with respect to the referenced theory.

Theory says:

$p' = \frac{1}{4 \pi} \frac{\vec{r}}{| \vec{r} | ^2} \cdot \left( \frac{\vec{F}}{| \vec{r} |} + \frac{1}{c_0}\frac{d(\vec{F})}{d(t)} \right)$

In the implementation we have:

Code:

  sum((pp*sqr(invMagR) + invMagR/c0_*dpdtp)*(Sfp & r));

Shouldn't be something like:

Code:

sum((pp*invMagR + c0_*dpdtp)*(Sfp & r)*sqr(invMagR)) / (4.0 *M_PI);

Am I missing something?

Thanks!

alfiogn · January 16, 2022, 16:22

cant delete this comment so wrote this

AlbertoArtoni · January 19, 2022, 02:29

Still, I don't understand why in the code there isn't the term $\frac{1}{4\pi r}$ .

Any clues?

January 16, 2022, 11:02	Help Curle Post Processing	#1
AlbertoArtoni New Member Alberto Artoni Join Date: Oct 2019 Posts: 7 Rep Power: 6	Hi! I was checking the implementation of the function object Curle. I don't understand how it has been implemented with respect to the referenced theory. Theory says: $p' = \frac{1}{4 \pi} \frac{\vec{r}}{\| \vec{r} \| ^2} \cdot \left( \frac{\vec{F}}{\| \vec{r} \|} + \frac{1}{c_0}\frac{d(\vec{F})}{d(t)} \right)$ In the implementation we have: Code: sum((ppsqr(invMagR) + invMagR/c0_dpdtp)(Sfp & r)); Shouldn't be something like: Code: sum((ppinvMagR + c0_dpdtp)(Sfp & r)sqr(invMagR)) / (4.0 M_PI); Am I missing something? Thanks!

January 16, 2022, 16:22		#2
alfiogn New Member Giorgio Negrini Join Date: Feb 2020 Location: Milan Posts: 13 Rep Power: 6	cant delete this comment so wrote this Last edited by alfiogn; January 27, 2022 at 11:32.

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January 19, 2022, 02:29		#3
AlbertoArtoni New Member Alberto Artoni Join Date: Oct 2019 Posts: 7 Rep Power: 6	Still, I don't understand why in the code there isn't the term $\frac{1}{4\pi r}$ . Any clues?