Using MAXFEA code in combination with ANSYS APDL for the simulation of plasma disruption events on EU DEMO

Lombroni, R.; Giorgetti, F.; Calabrò, G.; Fanelli, Pierluigi; Ramogida, G.

doi:10.1016/j.fusengdes.2021.112697

“…Usually, MDs are more frequent but also hot VDEs can happen, often when the plasma is perturbated far from the neutral point or when the vertical position controller actuator is working near its limit. The MAXFEA simulation of JET discharge #92132 has been used as guideline in the investigation of plasma behavior during a set of possible MDs and hot VDEs, both occurring at start of flat-top phase (SOF) and at end of flat-top (EOF) phase [19].…”

Section: Type 1 and Type 3 Vde Analysis Considering Demo20171c Scenariomentioning

confidence: 99%

“…Since in the halo module it is no longer possible to directly impose the evolution of the plasma current, the CQ is simulated imposing a certain negative voltage on plasma to reproduce a similar current evolution (see Figure 38). Although divergent behaviours are evident between simulated and experimental data at CQ starting time (see Figure 39), the proposed procedure could give useful indications on plasma centroid movement in vertical and radial direction to be taken into account during VDE analysis, considering all the possible sources of discrepancies due to the model simplifications introduced for MAXFEA code simulation and discussed in [19].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Inter-machine plasma perturbation studies in EU-DEMO relevant scenarios: lessons learnt for EM forces prediction during VDEs

Sias

¹

,

Minucci

²

,

Lacquaniti

³

et al. 2022

Nucl. Fusion

Self Cite

0

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To support the deployment of DEMO wall protection strategy, the development of comprehensive analyses is essential to understand the implications of transient perturbations on the plasma shape control and on the vertical stability, some of the most critical aspects to be considered in elongated plasmas. Therefore, the design activities of the DEMO limiter structures need the deep understanding of the effects induced by transient plasma perturbations coupled with one of the most severe load conditions occurring in tokamaks, the Vertical Displacement Event (VDE). Since Electromagnetic (EM) loads during VDE phases are among the DEMO limiters design drivers, this study focuses on predictive simulations of the final plasma position and of EM loads following a VDE. For this purpose, a multi-tokamaks study supported by the construction of an inter-machine database containing experimental transient plasma perturbations and VDEs from JET and ASDEX Upgrade (AUG) has been carried out. It aims at the characterization of some transient plasma perturbations that may lead to high control efforts by the vertical stability system in terms of variations of the plasma internal parameters and vertical displacements. Consequently, such experimental transient plasma perturbations have been properly scaled to DEMO reference geometries with different magnetic configurations, to be simulated in terms of plasma dynamical behaviour by means of MAXFEA code. Finally, initial predictive EM loads on DEMO limiter structures will be discussed in the case of VDEs following plasma perturbations.

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“…Where c1, c2, c3, and c4 are creep constants; Єcr is equivalent creep strain; σ is Equivalent stress; T is Absolute temperature and t is time. The modified time hardening equation creep constants are calculated using a mechanical APDL curve fitting method (Lombroni et al, 2021) by inserting the creep curve data generated from the existing literature for PP (Crawford et al, 2020) and HDPE (Pan et al, 2016). The creep constants calculated by solver by using curve fitting method for PP and HDPE material are shown in Figure 5…”

Section: Boundary Conditions and Simulationmentioning

confidence: 99%

Creep analysis of Water tank made of Polypropylene (PP) and High-Density Polyethylene (HDPE) polymer material using ANSYS Simulation

Vijay

¹

,

Jayapalan²

2022

JER is an international, peer-reviewed journal that publishes f

0

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The present study investigates the creep behavior of water tank manufactured from Polypropylene (PP) and High-Density Polyethylene (HDPE) polymeric material at 40 °C using ANSYS simulation software. Creep fracture is one of the major industrial problems for a product used for a long period of time. The creep analysis using simulation software is one of the ways to predict the life and durability of a plastic product with low cost and may help in optimizing its design. The PP and HDPE manufactured water tanks were commonly used for storing water in household and industrial applications. In this paper, a water tank were designed using an academic 3-Dimensional SOLIDWORKS software and ANSYS WORKBENCH were used for analyzing the creep strain for the developed CAD model. The CAD modelled water tank was tetrahedron meshed and simulated using static structural analysis and varying hydrostatic pressure were applied on the inner walls of the tank. The base of the tank was constrained to fixed. The analytical model based on modified time hardening creep model were implemented to analyze the creep strain. From the simulation, equivalent (Von-Misses) Stress, equivalent creep strain and total deformation were observed for the developed model. The obtained Creep strain-time graph were used to analyze the creep strain of PP and HDPE materials over a long period of time. From the simulation, it is observed that the material PP is more creep resistant than HDPE as equivalent stress of PP is more than HDPE at the applied hydrostatic pressure and the deformation for PP material were less compared to HDPE. The simulated limiting creep strain of PP as well as HDPE was in good agreement with the comparison of maximum limiting creep strain calculated from the material database.

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“…A set of disruptions following plasma perturbations adapted to DEMO conditions has been simulated by means of MAXFEA happen, often when the plasma is perturbated far from the neutral point or when the vertical position controller actuator is working near its limit. The MAXFEA simulation of JET discharge #92132 has been used as guide in the investigation of plasma behaviour during a set of possible MDs and hot VDEs, both occurring at the start of the flat-top phase (SOF) and at the end of the flat-top (EOF) phase [19].…”

Section: Type 1 and Type 3 Vde Analysis Considering Demo20171c Scenariomentioning

confidence: 99%

“…Among plasma transients, H-L transitions and mDs have been considered, the latter both in SN and QDN configurations. The extrapolation to DEMO has been realized using the most recent DEMO reference geometries (2017 and 2020) [19]. Finally, the main conclusions are given in section 6.…”

Section: Introductionmentioning

confidence: 99%

Inter-machine plasma perturbation studies in EU-DEMO-relevant scenarios: lessons learnt for prediction of EM forces during VDEs

Sias

¹

,

Minucci

²

,

Lacquaniti

³

et al. 2022

Nucl. Fusion

Self Cite

6

0

View full text Add to dashboard Cite

To support the deployment of DEMO wall protection strategy, the development of comprehensive analyses is essential to understand the implications of transient perturbations on the plasma shape control and on the vertical stability, some of the most critical aspects to be considered in elongated plasmas. Therefore, the design activities of the DEMO limiter structures need the deep understanding of the effects induced by transient plasma perturbations coupled with one of the most severe load conditions occurring in tokamaks, the Vertical Displacement Event (VDE). Since Electromagnetic (EM) loads during VDE phases are among the DEMO limiters design drivers, this study focuses on predictive simulations of the final plasma position and of EM loads following a VDE. For this purpose, a multi-tokamaks study supported by the construction of an inter-machine database containing experimental transient plasma perturbations and VDEs from JET and ASDEX Upgrade (AUG) has been carried out. It aims at the characterization of some transient plasma perturbations that may lead to high control efforts by the vertical stability system in terms of variations of the plasma internal parameters and vertical displacements. Consequently, such experimental transient plasma perturbations have been properly scaled to DEMO reference geometries with different magnetic configurations, to be simulated in terms of plasma dynamical behaviour by means of MAXFEA code. Finally, initial predictive EM loads on DEMO limiter structures will be discussed in the case of VDEs following plasma perturbations.

show abstract

Using MAXFEA code in combination with ANSYS APDL for the simulation of plasma disruption events on EU DEMO

Cited by 13 publications

References 11 publications

Inter-machine plasma perturbation studies in EU-DEMO relevant scenarios: lessons learnt for EM forces prediction during VDEs

Inter-machine plasma perturbation studies in EU-DEMO relevant scenarios: lessons learnt for EM forces prediction during VDEs

Creep analysis of Water tank made of Polypropylene (PP) and High-Density Polyethylene (HDPE) polymer material using ANSYS Simulation

Inter-machine plasma perturbation studies in EU-DEMO-relevant scenarios: lessons learnt for prediction of EM forces during VDEs

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