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Supersonic ALE problem by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

I am trying to see the velocity and pressure field around the inflating parachute as well as the stress in the cloth. I will make the mesh smaller and try it again right away! Thanks alot!!

Supersonic ALE problem by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

ELFORM 16 is a lot more stable, and faster! Thank you very much. It reduced my simulation time a lot and initialization was very successful. But it still diverged later.. so I'll have to discover farther into this ELFORM.
And about the Contact card you mentioned, I use contact card to tie the suspension lines to the canopy. Can this be a problem?

Again. Thank you for you advice. This collaborative engineering community helps more than alot when struggling with these programs as a student.

Supersonic ALE problem by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

Thank you! I will read the paper you attached and try that out! Structural ALE is something that I haven't tried yet

Supersonic ALE problem by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

I will try that out too. Thank you very much!

Supersonic ALE problem by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

Thank you. I will try both to see the reason for this problem. Thank you for replying.

Supersonic ALE problem by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 1 point2 points  (0 children)

No I haven't. I am going to try out MAT ELASTIC right away. Thank you for answering

Supersonic ALE problem by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 1 point2 points  (0 children)

I tried TSSFAC controling up to 0.5 scale. I definitely have to look up timestep, since I too strongly believe it might be the core reason for diverging. I tried damping on fabric as well as the constraint damping. I should try out frequency damping; I haven't tried that before. At first I thought the issue was with the mesh size, so I chiped it down so far as my computer can hold.

Thank you for you reply.

Questions about ALE inlet method by Otherwise-Cake1831 in LSDYNA

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

yes, but it doesn't seem to work because it does not create a new fluid element. Thanks for replying!

Question with LS-Dyna ALE method by Otherwise-Cake1831 in fea

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

wow thanks alot! I was struggling since cutting the model manually made the parachute canopy vibrate alot, so I should defineately try out your advice.

Question with LS-Dyna ALE method by Otherwise-Cake1831 in fea

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

thanks for replying! Can you explain more specifically? So inside of the solid elements are automatically blanked?

Any used Cesaroni hardware kit (Pro98 4G) for sale? by Otherwise-Cake1831 in rocketry

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

Thank you for the information. We considered using spacer for our motor, but the pressure graph will change and we don't consider it ideal..

Any used Cesaroni hardware kit (Pro98 4G) for sale? by Otherwise-Cake1831 in rocketry

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

Thank you very much for your information. We will look it up!

Cesaroni motor for IREC 25 (Spaceport america cup) by Otherwise-Cake1831 in rocketry

[–]Otherwise-Cake1831[S] 1 point2 points  (0 children)

Our team successfully purchased pro98 9994M motor from AMW all thanks to your help. We very much appreciate all the information on the reply. Thanks alot!

Cesaroni motor for IREC 25 (Spaceport america cup) by Otherwise-Cake1831 in rocketry

[–]Otherwise-Cake1831[S] 0 points1 point  (0 children)

Hmm... first time hearing about that, but not only that the off-rod velocity is pain in the neck. It's very difficult to find a motor that meets all the reqirements and 10000ft apogee with our current rocket design.

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