Jump to content

Search the Community

Showing results for tags 'stability'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • Altair Support Forum
    • Welcome to Altair Support Forum
    • Installation and Licensing
    • Modeling & Visualisation
    • Solvers & Optimization
    • Multi Body Simulation
    • Conceptual design and Industrial design
    • Model-Based Development
    • Manufacturing Simulation
    • CAE Process Automation
  • Academic Partner Alliance Forum
    • APA - Composites
    • APA - CFD & Thermal
    • APA - Vehicle Dynamics
    • APA - Manufacturing
    • APA - Crash and Safety
    • APA - Noise, Vibration and Harshness
    • APA - System Level Design
    • APA - Structural and Fatigue
    • APA - Marine
    • APA - Optical Design
  • Japanユーザーフォーラム
    • ユーザーフォーラムへようこそ
    • Altair製品の意外な活用例
    • インストールとライセンス
    • モデリング(プリプロセッシング)
    • シミュレーション技術(ソルバー)
    • データ可視化(ポストプロセッシング)
    • モデルベース開発
    • コンセプト設計と工業デザイン
    • 製造シミュレーション
    • CAE プロセスの自動化
    • 学生向け無償版
    • エンタープライズソリューション

Categories

There are no results to display.


Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

Joined

  • Start

    End


Group


AIM


MSN


Website URL


ICQ


Yahoo


Jabber


Skype


Interests


Organization

Found 2 results

  1. Hi All, I wanted to simulate conjugate heat transfer simulation in AcuSolve which involves Conduction & Mixed convection. I have followed the best practices that are described from meshing to problem setup. Herewith, im attaching my residual plot which seems not converged and stabilized results. It would be helpful if someone help me with this.
  2. Hello, I have been trying to understand and adapt the Radioss Thermal Example (RD-5300), in order to make it represent the stress relief procedure. Alternatively, as the time of operation is relatively short, one might think of it as a welding process, with a lot of heat input into the material and generating large temperature gradients. I have been using HW2017.2. The assumptions are as follows: 1. The "weld" along a square trajectory is subject to a high thermal load from the "Source". 2. The "Source" has a constant temperature of 1300 K, and transfers heat through Inter/Type7 to the plate. The coefficient of exchange is high (1000 units), in order to provide a lot of heat in limited time. 3. The heat transfer is based on the actual temperatures of both components (i.e. Ithe=1). 4. The convection heat transfer coefficient is arbitrarily chosen as 1.0, and the ambient temperature is set to 298 K. 5. The initial temperature of the plate is 298 K, i.e. it is the room temperature. Now, the results are puzzling. I particular, I obtain some negative temperatures on the contour plot, and there are temperature "waves"/"oscillations" on the model. I suppose it is associated with the thermal stability conditions and the mesh sizing, but - RADIOSS does not generate any warning - I guess the Help system has some gaps in the relevant topic, and I am not able to figure out how to correct the model. In particular, /DT/THERM, according to the Help page seems to require no parameters, whereas I suppose it should work like /DT or /DT/NODA. I find as well the /THERMAL topic very limited, and I do not know how to properly use the time scaling for thermal material data - In particular, I do not now to interpret the time stability limit. Should the time chosen be smaller than the one calculated from the formula, or rather larger? - In the help system, I could not find hints on correct meshing for a thermal transient problem - I was not able to find a means of making Radioss (or HyperMesh, or HyperView) estimate and present the local values of thermal stable time step, and the time step chosen for the simulation seems to be derivced from the standard "mechanical" Courant condition. Artificial reduction by /DTIX did not help in this case. Please shed some light on the topic Regards and thanks in advance Marek Augustyniak Poland Alu_Stress_Relief.zip
×
×
  • Create New...