Hi Bruno,
Thank you for the reference.
>> If I understand correctly, your right-hand-side is similar to a Dirac
delta. So when you write your weak form, your right-hand-side is something
like \int \int \phi(x,y)
>> \delta(x_0,y_0) dx dy = \phi(x_0,y_0) So to build your right-hand-side,
you just need to evaluate the test functions at one point.
Yes, as mentioned in the cited thread with the dirac delta function, my
\phi(x,y) is just a constant. So my question is, shouldn't the value on the
graph attached show a value of 1 without multiplying this constant \phi
value?
The function is as follows:
template <int dim>
void AdvectionProblem<dim>::create_point_source()
{
Point<dim> sourcePoint;
for(unsigned int i = 0; i < dim; ++i )
{
sourcePoint(i) = 0.6;
}
VectorTools::create_point_source_vector(dof_handler, sourcePoint,
right_hand_side);
// right_hand_side /= 800; //80; //10;
}
//====================
// In all static functions
//====================
beta(0) = 1.;
beta(1) = 1.;
//====================
// function name : BoundaryValues<dim>::value_list(...)
//====================
values[i] = 0;
On Friday, May 12, 2017 at 2:19:05 PM UTC+2, Bruno Turcksin wrote:
>
> Kartik,
>
> On Thursday, May 11, 2017 at 7:05:35 PM UTC-4, Kartik Jujare wrote:
>>
>> I added a create_point_source function after the assemble function in
>> step 12. I have also changed the beta value to (1, 1) and g=0 everywhere on
>> the boundary. Although the solution is similar to what I expected. I am not
>> able to understand why the magnitude is scaled by an arbitrary number(or
>> are they arbitrary?), in my case 800. Inside this
>> create_point_source_vector function, only the shape values get added to the
>> rhs then where does this magnitude come from and how can one control it?
>> Would be grateful to anyone who can shed some light on this.
>>
> We need to see the function but you may want to look here for example on
> how to do a point source
> https://groups.google.com/forum/#!searchin/dealii/dirac$20delta%7Csort:relevance/dealii/HTcSxhnzc5s/jDTMErSICAAJ
>
> Best,
>
> Bruno
>
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