# LinearSolve error: encountering machine-number overflow in PDEs resolution

Posted 4 months ago
579 Views
|
1 Reply
|
0 Total Likes
|
 Hi everyone, I am new of Mathematica.. I am trying to solve a set of partial differential equations in 4 four variables (x,y,z,t). When I set up the resolution as follows:[...]PD equations[...] bcs = {DirichletCondition[{Ux[x, y, z, t] == 0., Uy[x, y, z, t] == 0., Uz[x, y, z, t] == 0.}, True]}; ics = {Ux[x, y, z, 0] == 0, Uy[x, y, z, 0] == 0, Uz[x, y, z, 0] == 0, T[x, y, z, 0] == Piecewise[{{Subscript[T, hot], (x - (l/2.0))^2 + (y - (d/2.0))^2 + (z - (h/2.0))^2 <= hotSphereRadius^2}}, Subscript[T, eq]]}; pde = Operator == {0, 0, 0, 0}; {Ux0, Uy0, Uz0, T0} = NDSolveValue[{pde, ics, bcs}, {Ux, Uy, Uz, T}, {t, 0, Subscript[tt, last]}, {x, y, z} \[Element] mesh, DependentVariables -> {Ux, Uy, Uz, T}, Method -> Automatic]; I get the following error:LinearSolve::mcovl: The computation encountered machine-number overflow. Only machine-number code is available for sparse matrices. If your matrix is not too large, consider trying again after using Normal on the matrix.Have you ever encountered this error? What would you try to do to solve this issue? I can provide more infos if needed. Thanks in advance!Enrico
Answer
1 Reply
Sort By:
Posted 4 months ago
 Crossposted here.
Answer
Reply to this discussion
Community posts can be styled and formatted using the Markdown syntax.
Reply Preview
Attachments