Learning Forum

[Prem1996]

I performed a 3D simulation of the shock wave in shock tube using shock capturing method. Now I want to plot a graph of x-t (x co ordinate vs. time) for the shock wave in the shock tube. It was a unsteady with inviscid model, simulation using the Ansys Fluent. So, is there any way that I can plot x-t graph for the shock wave using the Ansys Post-Processing??nThank You.nnRegards,nPremn

[Karthik Remella]

Hi,
Do you mean variation of a flow variable such as density along both X and in time? Is this what you are looking for? If this is the case, you can create a contour plot at periodic intervals in time and play through all these plots as an animation.
Karthik

[Prem1996]

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Kremella Thank You sir for responding. Yes, I can plot the contours of different property but I am talking about the x-t diagram which shows the location of shock in space as time changes. It looks something like attached photo. I am not sure how to do that but want to plot that kind of graph for my research work.

Thank You.

Regards,

Prem

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[Rahul Kumar]

Hello Prem,
You could create a gradient and use the gradient to track the location of the shock.

[Prem1996]

Respected Sir,
Array Thank You Sir. Could you please elaborate it. Like which gradient I should go for. Is it pressure gradient or the velocity gradient??

Thank You

Regards
Prem

[YasserSelima]

Both should work ... one goes up and the other goes down.

[Prem1996]

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And I have one more question. I am using explicit formulation with explicit transient formulation to simulate the shock wave in shock tube using inviscid model. but the residuals are not going below 10^-1. Here I attached the photograph of the residuals vs iterations. So, can I consider this solution as converged one. Can I trust this solution?? How can I make sure that it is converged??

Thank You.

Regards,

Prem

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[YasserSelima]

Definitely not converging.
How does your mesh look like? Are you using density solver? your time step?

[Prem1996]

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Yes I am using density solver. And here I am attaching few photographs which shows the geometry and mesh. max skewness is 0.4246 and min is O(10^-3). Min orthogonal 0.905 and average orthogonal is 0.9987.

thank you.

regards

prem

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[Prem1996]

And yes I just used the courant number 0.5 instead of the time step size.
thank you

Regards
prem

[YasserSelima]

Hi Array
I don't see your mesh causing this large residuals. They are slightly large but I don't think they case this issue. and 0.5 Global Courant number is good.
Not sure what is the issue

[Prem1996]

Array Thank you

[AnaKh]

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Prem1996

Hello,

I was wondering if your issue is resolved. I am modeling a 3d shock wave propagation in air and I am getting the same convergence plots.

Best,

Anahid

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[Prem1996]

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Yes https://www.youtube.com/watch?v=3FHk1_vCpkk&ab_channel=AnsysLearning" and It solved my problem.

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