GATE EC 2016 Set 2 — Question 36
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Engineering Mathematics → Differential Equations → First-Order Linear Equations
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Question
The ordinary differential equationis to be solved using the forward Euler method. The largest time step that can be used to solve the equation without making the numerical solution unstable is ________
Correct answer
0.6 to 0.7
Solution
For an ordinary differential equation of the form , the forward Euler method is numerically stable if , where is the time step. In this problem, , so the eigenvalue . The stability condition is:Subtracting 1 from all sides:Dividing by -3 (and reversing the inequalities):The largest time step is . This value falls within the range 0.6 to 0.7.
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