how to solve convective flux exceeded stability limit?

floagde · December 29, 2024, 07:59

I am simulating the additive manufacturing by a laser. the beam source is added in qsadd.f in which I modified rhoe. But the simulation is always show "convective flux exceeded stability limit". And my max fuild temperature is up to 60,000, min fuid temperature is down to 0. I try to Modify the numerics options, it doesn't work. How can I solve it? anyone can help me?

koful · January 20, 2025, 00:36

Did you try to reduce the max time step

floagde · February 21, 2025, 01:36

Thank you for your answer. I try it, but it doesn't work. And I find that it can run if I ignore this problem, and this tip will disappear when the calculations settle down. It just appear in the first. Is that because the great chage of the fluid?

December 29, 2024, 07:59	how to solve convective flux exceeded stability limit?	#1
floagde New Member Gang Xi Join Date: Nov 2024 Posts: 3 Rep Power: 2	I am simulating the additive manufacturing by a laser. the beam source is added in qsadd.f in which I modified rhoe. But the simulation is always show "convective flux exceeded stability limit". And my max fuild temperature is up to 60,000, min fuid temperature is down to 0. I try to Modify the numerics options, it doesn't work. How can I solve it? anyone can help me?

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January 20, 2025, 00:36		#2
koful Member Join Date: Jun 2014 Location: Turkey Posts: 59 Rep Power: 12	Did you try to reduce the max time step

February 21, 2025, 01:36		#3
floagde New Member Gang Xi Join Date: Nov 2024 Posts: 3 Rep Power: 2	Thank you for your answer. I try it, but it doesn't work. And I find that it can run if I ignore this problem, and this tip will disappear when the calculations settle down. It just appear in the first. Is that because the great chage of the fluid?