# Plasma Process Error **URL:** \ **Category:** Project Support\ **Created:** [November 13, 2018, 12:35pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492 "2018-11-13T12:35:31Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![nnandakumar](https://www.simscale.com/forum/letter_avatar/nnandakumar/32/5_5575768a8748004e209b776fc1b2916d.png) [@nnandakumar](https://www.simscale.com/forum/u/nnandakumar)\ **Post date:** [November 13, 2018, 12:35pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/1 "2018-11-13T12:35:31Z")
I want to move the heat source across the length of the cylinder. I am not able to figure out how to do this? The problem is if I choose surface heat flux, then I have to choose a surface of the cylinder but I do not know how my equation works then. Does anyone have any suggestions? ---
**Author:** ![Get\_Barried](https://www.simscale.com/forum/user_avatar/www.simscale.com/get_barried/32/20599_2.png) [@Get\_Barried](https://www.simscale.com/forum/u/Get_Barried)\ **Post date:** [November 13, 2018, 12:42pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/2 "2018-11-13T12:42:57Z")
Hi @nnandakumar, Please post a appropriate title. I’ve changed it for you. Project links should be in the post itself. Your project is [here](https://www.simscale.com/projects/nnandakumar/project2/) for everyone’s reference. CHT is not my main area so maybe @jousefm or the other users can give you some advice. If I find anything I will be sure to post. Cheers. Regards, Barry ---
**Author:** ![nnandakumar](https://www.simscale.com/forum/letter_avatar/nnandakumar/32/5_5575768a8748004e209b776fc1b2916d.png) [@nnandakumar](https://www.simscale.com/forum/u/nnandakumar)\ **Post date:** [November 13, 2018, 12:51pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/3 "2018-11-13T12:51:03Z")
Thank you for the help 🙂 ---
**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\ **Post date:** [November 13, 2018, 1:04pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/4 "2018-11-13T13:04:29Z")
Hi @nnandakumar and @Get_Barried! Not sure if you are looking for something like this: **[Thermal benchmark (steady state)](https://www.simscale.com/forum/t/thermal-benchmark-steady-state/28052)** - assuming that you have a cylinder and you want to validate your results. Best, Jousef ---
**Author:** ![nnandakumar](https://www.simscale.com/forum/letter_avatar/nnandakumar/32/5_5575768a8748004e209b776fc1b2916d.png) [@nnandakumar](https://www.simscale.com/forum/u/nnandakumar)\ **Post date:** [November 13, 2018, 1:46pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/5 "2018-11-13T13:46:54Z")
I want to do something similar to this: > **[SimScale Login](https://www.simscale.com/workbench/?pid=5255702622926571387&mi=spec%3Acadb9ee6-38fe-4437-81ad-4ec7a85a951d%2Cservice%3ASIMULATION%2Cstrategy%3A2&ps=)** > > Log in to your SimScale account. SimScale makes high-fidelity engineering simulation technically and economically accessible. At any scale. In the cloud. but on the outer surface of a cylinder. ---
**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\ **Post date:** [November 13, 2018, 2:12pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/6 "2018-11-13T14:12:10Z")
Hi @nnandakumar! The project seems to be private - change the settings that we can see it or share it with us by using the username or mail address. Cheers, Jousef ---
**Author:** ![nnandakumar](https://www.simscale.com/forum/letter_avatar/nnandakumar/32/5_5575768a8748004e209b776fc1b2916d.png) [@nnandakumar](https://www.simscale.com/forum/u/nnandakumar)\ **Post date:** [November 13, 2018, 2:28pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/7 "2018-11-13T14:28:43Z")
Hey I changed it. You can see it now. ---
**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\ **Post date:** [November 14, 2018, 8:28am UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/8 "2018-11-14T08:28:50Z")
Hi @nnandakumar! * * * q = \frac{2P}{\pi r\_0^2} exp\left(-\frac{2r^2}{r\_0^2} \right) - P is the power of laser, 2 kW in our case. - r\_o is the radius of laser beam, 0.003 m (3 mm) in our case. - r = \sqrt{(x-x\_o)^2+(y-y\_o)^2} is the radial distance of the beam from any point. Here, x and y are x and y direction of the coordinate system respectively. xo and yo are the terms used for defining the motion. In our case, x\_o = a + R\*cos(2 \pi v\_\alpha t) and y\_o = b + R sin(2\pi v\_α t), where; - a and b are the x and y coordinates of the circle center, in our case (a,b)=(0,0). - R is the radius of the circle, 0.035 m (3.5 cm) in our case. - v\_\alpha is the angular velocity of the beam, 0.167 \frac{rad}{s} in our case. The actual velocity of the beam can be calculated by v = 2\pi R v\_\alpha which gives v ~ 0.037 \frac{m}{s} (~2.22 \frac{m}{min}.) - t is time step which is 6 s for a full revolution with timestep length of 0.06 s in our case i.e. cos(2\pi) and sin(2\pi) occurs when v\_\alpha\*t = 0.167 \frac{rad}{s} x 6 s = 1 rad * * * Does this help? Cheers! Jousef ---
**Author:** ![nnandakumar](https://www.simscale.com/forum/letter_avatar/nnandakumar/32/5_5575768a8748004e209b776fc1b2916d.png) [@nnandakumar](https://www.simscale.com/forum/u/nnandakumar)\ **Post date:** [November 14, 2018, 11:16am UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/9 "2018-11-14T11:16:26Z")
I tried to use this equation but since I want to make the beam have helical motion on the outer surface of the cylinder, I am confused as to how to modify the equation and what coordinate system to use :(. I want to first start by just moving the beam in a straight line on the outer curved surface of the cylinder and then introduce also a circular motion. I hope that I am able to explain my idea clearly. ---
**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\ **Post date:** [November 15, 2018, 12:50pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/10 "2018-11-15T12:50:10Z")
Sorry for the late response @nnandakumar! I hope that I can have a look at your project later this day and get back to you as soon as know more. Best, Jousef ---
**Author:** ![nnandakumar](https://www.simscale.com/forum/letter_avatar/nnandakumar/32/5_5575768a8748004e209b776fc1b2916d.png) [@nnandakumar](https://www.simscale.com/forum/u/nnandakumar)\ **Post date:** [November 27, 2018, 10:08am UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/11 "2018-11-27T10:08:50Z")
was anyone able to find something out ?😧😧 ---
**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\ **Post date:** [November 27, 2018, 7:12pm UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/12 "2018-11-27T19:12:14Z")
Did not have the time so far @nnandakumar. Let me tag my colleagues @BenLewis and @cjquijano here who might jump in in the meantime. Best, Jousef ---
**Author:** ![nnandakumar](https://www.simscale.com/forum/letter_avatar/nnandakumar/32/5_5575768a8748004e209b776fc1b2916d.png) [@nnandakumar](https://www.simscale.com/forum/u/nnandakumar)\ **Post date:** [November 28, 2018, 9:08am UTC](https://www.simscale.com/forum/t/plasma-process-error/83492/14 "2018-11-28T09:08:49Z")
> **[Gaussian beam incident on a plate. by nnandakumar | SimScale](https://www.simscale.com/projects/nnandakumar/tryyyy/)** > > A Gaussian is moving along a straight line on a steel plate. | Simulation project by nnandakumar Like this but on a cylinder.