Recent content by debsankar

I am not good at integrations... but here is a answer kind of thing done in mathematica... you can check your results with it... Sorry, could not really help you.

@ Chestermiller I will get back to this tomorrow, I got what you said... actually you are right I also have df/dx values at boundary...as I have du/dx. I will explain in details my equations and what I am getting. goodbye till then.

Also there is another small confusion.. say I have an eq like this >> ------------------------------------------------- \dot{u} = \partial_x{f(\partial_x{u})} and if my BC now is >> \partial_x{u} = 0 at both ends for all time. --------------------------------------------------- Now I...

This is the problem the thread started with. Regards.

@ AlephZero >> Thanks for the reference. I will describe a bit what I did for the completeness of the thread and also to clear misconceptions if I have got any in this regard. To calculate \partial_x{u} at boundaries I use >> -------------------------------------------------- \partial_x{u}...

Hi all, It may be a trivial question. But, if I have a PDE of variable u(x,t) -------------------------------- \dot{u} = f(u,\partial_x{u},..) with boundary condition : u(0,t) = u(L,t) =0. -------------------------------- Now I need to calculate \partial_x{u} for that can I define the...

For F1x and F1y , first calculate the projection on the given line in between x and -y >> G = F1 cos(90-35) then F1x = G cos(20) and F1y = G cos(90+20) . For F1 in the direction of F2 just take the dot product... (F1.F2)/ |F2|. seems right to me, but please check with the angles and all...

Just passing by... so thought I will explain what happened back then >> When using LAPACK subroutines in your fortran code while passing variable (array or matrix) to LAPACK its better to use a dummy variable to pass, because LAPACK changes your input arrays too. Then when you try to use the...

1. I am really sorry to post it so badly... It was my first time and I was in hurry... Thank you all for the suggestions... 2. I assumed people will get the problem... it happens when you are working with a problem long enough... but it does not work like that... sorry again ! 3. Now...

I am trying to solve Diffusion eq with implicit method using DGESV subroutine from lapack... But my periodic boundary condition is not working.. Here is my code: attached... please help.